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Your search keyword '"Martínez-De-Guerenu, A."' showing total 93 results
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93 results on '"Martínez-De-Guerenu, A."'

1. A regressor-based hysteresis formulation for the magnetic characterisation of low carbon steels

Author

Skarlatos, A., Martínez-De-Guerenu, A., Miorelli, R., Lasaosa, A., and Reboud, C.

Subjects
Condensed Matter - Materials Science
Abstract

In this work, two different parametric hysteresis models, the Jiles-Atherton model and the Mel'gui relation, have been combined to form a more general hysteresis operator, suitable for the description of families of experimental B(H) curves obtained for low carbon (LC) steel specimens after isothermal annealing at different temperatures and times. As it has been demonstrated in a number of previous studies, characteristic values of steel hysteresis curves can be used as very efficient identifiers for the monitoring of the different metallurgical transformations that take place during the annealing, such as recovery and recrystallisation processes. It is thus important from a practical point to be able to reproduce the experimental curves obtained under different conditions, as precisely as possible, in order to proceed to the samples characterisation. Hybridisation of the two aforementioned models demonstrated satisfactory results for the reproduction of all considered curves obtained under the different considered annealing conditions.

Published
2024
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2. Postoperative Critical Care Admission Was Not Associated with Improved Postoperative Outcomes in Elective Colorectal Surgery: Secondary Analysis Of POWER Trial

Author

Suárez-de-la-Rica, Alejandro, Ripollés-Melchor, Javier, Aldecoa, César, Abad-Motos, Ane, Ferrando, Carlos, Abad-Gurumeta, Alfredo, Díaz-Almirón, Mariana, Gil-Lapetra, Cristina, García-Miguel, Francisco Javier, Pedregosa-Sanz, Ana, Esteve-Pérez, Neus, Rodríguez-Jiménez, Rita, Gimeno Fernandez, Pablo, Maseda, Emilio, Garcia-Perez, Cristina, Higuera-Míguelez, Eva, Marcos-Vidal, José M., Merino-García, María, Rubio-López, Ana B., Pascual-Diez, María E., García-Miguel, Francisco J., Cabezudo-Sanjose, Luis R., Martínez-Díaz, Ruth, Alegría-Rebollo, Sara, González-Rodríguez, José L., Vega-Cruz, María S., Martínez-Ragüés, Gema, Gómez-Ríos, Manuel A., Mosquera-Rodríguez, Eva, Del-Río-Regueira, Sara, Perez-Valdivieso, José R., Martin-Vizcaino, Marta, Hernandez-Garcia, Susana, Yoldi-Murillo, Francisco J., Salvador-Bravo, Miguel, Rubial-Alvarez, Manuela, Oteiza-Martinez, Fabiola, Balen-Rivera, Enrique, Garcia-Erce, José A., Zugasti-Murillo, Ana, Petrina-Jáuregui, María E., Bustos-García, Domingo, Sánchez-Conde, María P., Rodríguez-Calvo, Antonio, Hernández-Valero, María A., Angoso-Clavijo, María, González-Fernández, Luis M., Bravo-Riaño, Miguel A., Arnes-Muñoz, María V., Bustos-Molina, Filadelfo, Paz-Martín, Daniel, Vázquez-Vicente, Bárbara, González-López, Lourdes, Mínguez-Marín, Conrado, Diz-Jueguen, Susana, Seoane-Antelo, Jaime, Ballinas-Miranda, Julio, Carrera-Dacosta, Ester, Barreiro-Domínguez, Erica, Piñeiro-Teijeiro, Alexandra, Sanchez-Santos, Raquel, Varela-Duran, Marina, Diaz-Parada, Pilar, Calero-Lillo, Aránzazu, López-Lara, Manuel Ángel, Muñoz-Collado, Salvador, Valverde-Sintas, Juan, Aznar-Puig, Silvia, Troyano-Escribano, Daniel, Marmaña-Mezquita, Sandra, Fernanz-Antón, Jesús, Catot-Alemany, Lucia, Balust, Jaume, Ubré, Marta, Ferrando-Ortolá, Carlos, Martínez-Pallí, Graciela, Ibarzabal, Ainitze, Lacy, Antonio M., Sánchez-Martín, Rubén, Martins-Cruz, Karina, Pérez-Jiménez, Paula, Casans-Francés, Rubén, Longás, Javier, Ramírez Rodríguez, José M., Elia, Manuela, Mugarra-Llopis, Ana, Crisan, Cristina, Gracia-Ferrándiz, Estefanía, Romero-Vargas, Esther, Soro-Domingo, Marina, Prada-Martin, Blanca, Muñoz-Hernández, Henar, Gómez Herreras, José I., Cocho-Crespo, Sara, Fernández-Caballero, Sandra, Flores-Crespo, Miguel, Vázquez-Fernández, Andrea, Brugiotti, Carlo, Ollé-Sese, Estefanía, Houghton-Acuña, Carla R., López-Doucil, Marta, Tarazona-López, Ernesto A., Bel-Marcobal, Iván, González-Cogollor, Sonia, Llácer-Pérez, Manuel, Arias-Romano, Alberto, Arrabal-Taborda, María C., Caballero-Domínguez, Mercedes, García-López, Rafael, Ontoria-Muriel, Julio, Vivó-Blasco, Antonio, Del-Cojo-Peces, Enrique, Tena-Guerrero, Jose M., Alcalde Matas, Fernando, Giordano, Hernán, Perez Peña, Jose M, Olmedilla-Arnal, Luis, Benito-Saz, Pilar, López-Gil, Elena, Ruiz-Ortega, Adela, Zapatero-García, Sara, Del-Valle-García, Emilio, Soria-Aledo, Víctor, Pérez-Guarinos, Carmen V., Pellicer-Franco, Enrique, Valero-Navarro, Graciela, Mengual-Ballester, Mónica, García-Marín, José Andrés, Romero-Simó, Manuel, Caravaca-García, Ibán, Blasco-Segura, Teresa, Campo-Betancourth, Carlos F., Costa-Navarro, Rafael David, Jordá-Sanz, Laura, De-Miguel-Cabrera, María I., España-Pamplona, José M., Gil-Trujillo, Silvia, Redondo-Calvo, Francisco J., Baladrón-Gónzalez, Víctor, Moreno-Ballesteros, Remedios, Muñoz-Rodes, José L., Miranda, Elena, Roselló-Chornet, Marta, Alós-Zaragoza, Lourdes, Catalá-Bauset, Juan, Pallardo-López, María A., Almenara-Almenara, Noemí, Muñoz-Devesa, Lorena, Gimeno-Fernández, Pablo, Gómez-Agraz, José L., Iglesias-Morales, Carla, Ordoñez-Enireb, Paola B., Ríos-Villalba, Ana M., Rodríguez-Pinto, Joselvy, Sánchez-Cortés, Sergio, Montoya-Tabares, María J., Ruiz, Vicente, González-Sánchez, Francisco, Soriano-Giménez, Víctor, Muñoz-Camarena, José M., Benavides-Buleje, Jorge, Estupiñán-Jiménez, Juan C., Portero-Larragueta, Irene, Alias, David, Maristany-Bienert, Carlos, Pardo-López, José A., Ramiro-Ruiz, Álvaro, García, Pablo, Martínez-De-Guereñu, Arantza, Montalbán, Belinda, Olea, Claudia, Benguría, David, Silva, Javier, Calderón, Adriana, Escoll-Rufino, Jordi, Cerdan-Santacruz, Carlos, Sierra-Grañón, José E., Rufas-Acín, María, Mestres-Petit, Nuria, Penagos-Saavedra, Ingrid C., Moreno-Castilla, Cristina, Riera-Riu, Jordi, Cuellar-Martínez, Ana, González-Álvarez, R.C., Sánchez-Merchante, Míriam, García-Del-Valle-Y-Manzano, Santiago, García-Zamorano, Sara, Gijón-Herreros, Natalia, Robles-Ángel, Patricia, Roca-Castillo, Enrique, Mariscal-Flores, María L., Morales-Cayuela, Mario, Alonso-Ramos, Irene, Jiménez-Carneros, Virginia, Casalduero-Garcia, Lucas, Jimenez-Miramón, Javier, Ramos-Rodríguez, José L., Aracil-Escoda, Norma, Martínez-Hurtado, Eugenio, Nozal-Mateo, Beatriz, Sáez-Ruiz, Elena, Salvachua-Fernández, Rut, De-Fuenmayor-Valera, María L., Sánchez, Elena, Toribio, Begoña, Navarro-Sánchez, Antonio, López-Fernández, José, Montesdeoca Cabrera, Dácil, Alcalá-Serrano, Francisco J., Alberola-Estellés, María J., Díaz-Cambronero, Óscar, Matoses-Jaén, María S., Ruiz-Boluda, María D., Sancho-de-Ávila, Azahara, Díaz-Carrasco, Sofía, Martín-Martín, Almudena, Uña-Orejón, Rafael, Tejón-Pérez, Guillermo, Alfaro-Martínez, María V., Alonso-Fernández, Marta, Álvarez-Cebrián, María A., Álvarez-Del-Vayo-Rodríguez, María J., Carrillo-Rivas, Mariana, Fernández-Rodríguez, María, Trabanco-Morán, Sonia, Rábago-Morán, José L., Martínez-Ubieto, Javier, Pascual-Bellosta, Ana M., Ortega-Lucea, Sonia M., Santero-Ramirez, Maria P., Duque-Mallen, Maria V., Aragon-Benedi, Cristian, Vallejo-Tarrat, Andrea, Colillas-Calvet, Carmen, Laso, Maria J., Martinez-Cabañero, Javier, Hernández-Salván, Javier, Ledesma-Muñoz, Beatriz, Ochoa-Osorio, Carolina, Sanz-García, Máximo, Herrero-Garrote, Begoña, Blázquez-Martin, Alma, Díez-Alonso, Manuel, Hernández-Juara, Pilar, Muguerza-Huguet, José M., Barbero-Mielgo, Macarena, San-Antonio-San-Román, Belén, Alonso-Aguilar, Laura, Molnar, Viktoria, Delgado-Naviero, María C., Meléndez-Leal, Encarnación, Cavero-García, Virginia, Fernández-Sánchez, África, Cubek-Quevedo, Daniela A., Munar, Rocío Díez, Blázquez-Fernández-De-La Pradilla, Francisco J., Serrano, A.B., Balvís, A., Berruezo, A., Esparza, E., De la Hoz, I., Palavicini, A., Pereira, L., Vega, X., Villahoz, J., Villanueva, G., Alonso-Fernández, José I., Bolaño-Pérez, Clara, Villán-González, Teresa, Batalla, Astrid, Azparren, G., Basttita, M., Felipe, M., Cueva, L., Gine, Marta, Gómez-Caro, A.M., India, I., Piñol, S., Mora-Fernández, Carlos, Ferrer-Robles, Ana, Segura–Sampedro, Juan J., Alonso-Hernández, Natalia, Camps-Cervantes, Ángels, Chocrón-Da-Prat, Ivette, Coronado-Silva, Carolina C., Duque-Santos, Héctor, Esclapez-Sempere, Elena, Galan-Menéndez, Patricia, Matarín-Olmo, Silvia, Tormos-Pérez, M.P., Villarino-Villa, Laura, Bergés-Gutiérrez, Héctor, Aisa-Gasca, Miguel, Arbona-Camillero, Verónica, Bautista-González, José D., Carballido-Pascual, Francisco J., Gutiérrez-Moreno, Mercedes, Muñoz-Durán, Ana, Cañete-Gómez, Jesús, Cáceres-Fabrega, Esther, Lorente-Herce, José M., Mulet-Zayas, Octavio, Gómez-Pérez, Rocío, Monje-Salazar, Cristina, Lobato-Bancalero, Luis, Torres-Moreno, Carmelo, Sanchez-Cárdenas, Elena, Daza-González, Juan J., Sanchez-Viguera, Teresa, Dal-Fresno-Asensio, Antonio, Bermudez-Román, Laura, Sanllorente-Sebastian, Rodrigo, Villalain-Perez, Maria C., Siclama-Stroe, Mihaela, Benítez-Villar, Judith, Sánchez-Campos, Alberto, Martínez-Ruiz, Alberto, Alonso-Carnicero, Patricia, De-La-Torre-González, Francisco J., Naranjo-Checa, Carolina, Pereira-Pérez, Fernando, Ruiz-Ucar, Elena, Rivera, Alfredo, Nogués-Ramia, Eva M., Sosa-Quesada, Yolanda, Gómez, Alonso, Martínez-Meco-Ortiz, Laura M., Cabellos-Olivares, Mercedes, Rodríguez-Fraile, José R., Labalde-Martínez, María, Nacarino-Alcorta, Beatriz, Fernández-García, Raquel, De-La-Quintana-Gordon, Borja, Drewniak, Justyna, Senra-Lorenzana, Fátima, Galindo-Jara, Pablo, Gallardo-Herrera, Ana B., García-Llorente, Cesar, Colao-García, Laura, Rellán-Álvarez, Luz-Divina, Miro-Murillo, Miguel, Flores-Risco, Sahely-Claret, Serrat-Puyol, Jordi, Medina-Gallardo, Adrian, Mitsahid-Curbelo-Peña, Yuhami, Logroño-Ejea, Margarita, Jover-Pinillos, José L., Orts-Micó, Francisco J., Cózar-Lozano, Coral, Blasco-Delgado, Olga, Nonnemacher-San-Julián, Andrea, Pérez, José A., Durán Cruces, Durán, Blanco, Francisco J., Landaluce-Olavarria, Aitor, Badiola, Izaskun, Calvo, Marta, De-Andres, Unai, Portugal-Porras, Vicente, Ugarte-Sierra, Bakarne, Perelló-Cerdà, Laura, Rodríguez-Téllez, Yobanys, Grössl-Meleán, Joanna, Viñas-Truñén, Xavier, Alday-Muñoz, Enrique, Bermejo-Marcos, Elena, Alonso-Casado, Pedro A., Gimeno-Calvo, Francisco A., Rodriguez-Sánchez, Ana, Montes-López, Carmen, Álvarez-Llano, Laura, Fas-Vicent, María J., Ortega-Monzó, Juan M., Flores-Flores, Gustavo, Tristancho, José L., Bayo-Sans, Montserrat, Deiros-Garcia, María C., Gil-Gómez, María L., Parra, Lourdes, Tejedor-De-La-Fuente, Vanesa, Jericó-Alba, Carlos, Borrell Brau, Núria, Camacho-Martín, David, Ortiz-De-Zarate, Jose L., López-Ruiz, Daniel, Rodriguez-Bustamante, Vicens, Martinez-Vilalta, M., Amoros-Ruiz, Daniel, Sadurni-Sarda, Marc, and Renedo-Corcóstegui, Pablo

Published
2023
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4. Institutional factors associated with adherence to enhanced recovery protocols for colorectal surgery: Secondary analysis of a multicenter study

Author

Garcia-Perez, Cristina, Higuera-Míguelez, Eva, Marcos-Vidal, José M., Merino-García, María, Rubio-López, Ana B., Pascual-Diez, María E., García-Miguel, Francisco J., Cabezudo-Sanjose, Luis R., Martínez-Díaz, Ruth, Alegría-Rebollo, Sara, González-Rodríguez, José L., Vega-Cruz, María S., Martínez-Ragüés, Gema, Gómez-Ríos, Manuel A., Mosquera-Rodríguez, Eva, Del-Río-Regueira, Sara, Bustos-García, Domingo, Sánchez-Conde, María P., Rodríguez-Calvo, Antonio, Hernández-Valero, María A., Angoso-Clavijo, María, González-Fernández, Luis M., Bravo-Riaño, Miguel A., Arnes-Muñoz, María V., Perez-Valdivieso, José R., Martin-Vizcaino, Marta, Hernandez-Garcia, Susana, Yoldi-Murillo, Francisco J., Salvador-Bravo, Miguel, Rubial-Alvarez, Manuela, Oteiza-Martinez, Fabiola, Balen-Rivera, Enrique, Garcia-Erce, José A., Zugasti-Murillo, Ana, Petrina-Jáuregui, María E., Bustos-Molina, Filadelfo, Paz-Martín, Daniel, Vázquez-Vicente, Bárbara, González-López, Lourdes, Mínguez-Marín, Conrado, Diz-Jueguen, Susana, Seoane-Antelo, Jaime, Ballinas-Miranda, Julio, Carrera-Dacosta, Ester, Barreiro-Domínguez, Erica, Piñeiro-Teijeiro, Alexandra, Sanchez-Santos, Raquel, Varela-Duran, Marina, Diaz-Parada, Pilar, Calero-Lillo, Aránzazu, López-Lara, Manuel Ángel, Muñoz-Collado, Salvador, Valverde-Sintas, Juan, Aznar-Puig, Silvia, Troyano-Escribano, Daniel, Marmaña-Mezquita, Sandra, Fernanz-Antón, Jesús, Catot-Alemany, Lucia, Balust, Jaume, Ubré, Marta, Ferrando-Ortolá, Carlos, Martínez-Pallí, Graciela, Ibarzabal, Ainitze, Lacy, Antonio M., Sánchez-Martín, Rubén, Martins-Cruz, Karina, Pérez-Jiménez, Paula, Casans-Francés, Rubén, Longás, Javier, Ramírez Rodríguez, José M., Mugarra-Llopis, Ana, Crisan, Cristina, Gracia-Ferrándiz, Estefanía, Romero-Vargas, Esther, Soro-Domingo, Marina, Rodríguez-Jiménez, Rita, Prada-Martin, Blanca, Muñoz-Hernández, Henar, Gómez Herrera, José I., Cocho-Crespo, Sara, Fernández-Caballero, Sandra, Flores-Crespo, Miguel, Vázquez-Fernández, Andrea, Brugiotti, Carlo, Ollé-Sese, Estefanía, Houghton-Acuña, Carla R., López-Doucil, Marta, Tarazona-López, Ernesto A., BEL-Marcobal, Iván, González-Cogollor, Sonia, Llácer-Pérez, Manuel, Arias-Romano, Alberto, Arrabal-Taborda, María C., Caballero-Domínguez, Mercedes, García-López, Rafael, Ontoria-Muriel, Julio, Vivó-Blasco, Antonio, Blanco, Francisco J., DEL-Cojo-Peces, Enrique, Tena-Guerrero, Jose M., Landaluce-Olavarria, Aitor, Badiola, Izaskun, Calvo, Marta, DE-Andres, Unai, Portugal-Porras, Vicente, Ugarte-Sierra, Bakarne, Pedregosa-Sanz, Ana, Perelló-Cerdà, Laura, Rodríguez-Téllez, Yobanys, Grössl-Meleán, Joanna, Viñas-Truñén, Xavier, Alday-Muñoz, Enrique, Bermejo-Marcos, Elena, Alonso-Casado, Pedro A., Gimeno-Calvo, Francisco A., Rodriguez-Sánchez, Ana, Montes-López, Carmen, Álvarez-Llano, Laura, FAS-Vicent, María J., Ortega-Monzó, Juan M., Flores-Flores, Gustavo, Tristancho, José L., Bayo-Sans, Montserrat, Deiros-Garcia, María C., GIL-Gómez, María L., Parra, Lourdes, Tejedor-DE-LA-Fuente, Vanesa, Jericó-Alba, Carlos, Borrell-Brau, Núria, Camacho-Martín, David, Ortiz-DE-Zarate, Jose L., López-Ruiz, Daniel, Rodriguez-Bustamante, Vicens, Martinez-Vilalta, M., Amoros-Ruiz, Daniel, Sadurni-Sarda, Marc, Matas, Fernando A.L.C.A.L.D.E., Giordano, Hernán, Perez Peña, Jose M., Olmedilla-Arnal, Luis, Benito-SAZ, Pilar, López-GIL, Elena, Ruiz-Ortega, Adela, Zapatero-García, Sara, DEL-Valle-García, Emilio, Soria-Aledo, Víctor, Pérez-Guarinos, Carmen V., Pellicer-Franco, Enrique, Valero-Navarro, Graciela, Mengual-Ballester, Mónica, García-Marín, José Andrés, Romero-Simó, Manuel, Caravaca-García, Ibán, Blasco-Segura, Teresa, Campo-Betancourth, Carlos F., Costa-Navarro, Rafael David, Jordá-Sanz, Laura, DE-Miguel-Cabrera, María I., España-Pamplona, José M., GIL-Trujillo, Silvia, Redondo-Calvo, Francisco J., Baladrón-Gónzalez, Víctor, Moreno-Ballesteros, Remedios, Muñoz-Rodes, José L., Miranda, Elena, Roselló-Chornet, Marta, Alós-Zaragoza, Lourdes, Catalá-Bauset, Juan, Pallardo-López, María A., Almenara-Almenara, Noemí, Muñoz-Devesa, Lorena, Alcaide-Pardo, Benito, Gimeno-Fernández, Pablo, Gómez-Agraz, José L., Iglesias-Morales, Carla, Ordoñez-Enireb, Paola B., Ríos-Villalba, Ana M., Rodríguez-Pinto, Joselvy, Sánchez-Cortés, Sergio, Montoya-Tabares, María J., Ruiz, Vicente, González-Sánchez, Francisco, Soriano-Giménez, Víctor, Muñoz-Camarena, José M., Benavides-Buleje, Jorge, Estupiñán-Jiménez, Juan C., Portero-Larragueta, Irene, Alias, David, Alberola-Estellés, María J., Díaz-Cambronero, Óscar, Matoses-Jaén, María S., Ruiz-Boluda, María D., Maristany-Bienert, Carlos, Pardo-López, José A., Ramiro-Ruiz, Álvaro, García, Pablo, Martínez-DE-Guereñu, Arantza, Montalbán, Belinda, Olea, Claudia, Benguría, David, Silva, Javier, Calderón, Adriana, Escoll-Rufino, Jordi, Cerdan-Santacruz, Carlos, Sierra-Grañón, José E., Rufas-Acín, María, Mestres-Petit, Nuria, Penagos-Saavedra, Ingrid C., Moreno-Castilla, Cristina, Riera-RIU, Jordi, Cuellar-Martínez, Ana, González-Álvarez, R.C., Sánchez-Merchante, Míriam, García-DEL-Valle-Y-Manzano, Santiago, García-Zamorano, Sara, Gijón-Herreros, Natalia, Robles-Ángel, Patricia, Logroño-Ejea, Margarita, Sanllorente-Sebastian, Rodrigo, Villalain-Perez, Maria C., Siclama-Stroe, Mihaela, Benítez-Villar, Judith, Sánchez-Campos, Alberto, Martínez-Ruiz, Alberto, Alonso-Carnicero, Patricia, DE-LA-Torre-González, Francisco J., Naranjo-Checa, Carolina, Pereira-Pérez, Fernando, Ruiz-Ucar, Elena, Rivera, Alfredo, GIL-Lapetra, Cristina, Roca-Castillo, Enrique, Mariscal-Flores, María L., Morales-Cayuela, Mario, Alonso-Ramos, Irene, Jiménez-Carneros, Virginia, Casalduero-Garcia, Lucas, Jimenez-Miramón, Javier, José, L., Nogués-Ramia, Eva M., Sosa-Quesada, Yolanda, Gómez, Alonso, Martínez-Meco-Ortiz, Laura M., Cabellos-Olivares, Mercedes, Rodríguez-Fraile, José R., Labalde-Martínez, María, Ramos-Rodríguez, Nacarino-Alcorta, Beatriz, Fernández-García, Raquel, DE-LA-Quintana-Gordon, Borja, Drewniak, Justyna, Senra-L, Fátima, Galindo-Jara, Pablo, Gallardo-Herrera, Ana B., García-Llorente, Cesar, Colao-García, Laura, Rellan-Álvarez, Luz-Divina, Miro-Murillo, Miguel, Flores-Risco, Sahely-CLARET, Serrat-Puyol, Jordi, Medina-Gallardo, Adrian, Mitsahid-Curbelo-Peña, Yuhami, Orenzana, Abad-Motos, Ane, Abad-Gurumeta, Alfredo, Aracil-Escoda, Norma, Martínez-Hurtado, Eugenio, Nozal-Mateo, Beatriz, Sáez-Ruiz, Elena, Salvachua-Fernández, Rut, Ripollés-Melchor, Javier, DE-Fuenmayor-Valera, María L., Sánchez, Elena, Toribio, Begoña, Navarro-Sánchez, Antonio, López-Fernández, José, Montesdeoca-Cabrera, Dácil, Alcalá-Serrano, Francisco J., Sancho-DE-Avila, Azahara, Diaz-Carrasco, Sofia, Martín-Martín, Almudena, Suarez-DE-LA-Rica, Alejandro, UÑA-Orejón, Rafael, Maseda, Emilio, Tejón-Pérez, Guillermo, Alfaro-Martínez, María V., Alonso-Fernández, Marta, Álvarez-Cebrián, María A., Álvarez-DEL-Vayo-Rodríguez, María J., Carrillo-Rivas, Mariana, Fernández-Rodríguez, María, Trabanco-Morán, Sonia, Rábago-Morán, José L., Martínez-Ubieto, Javier, Pascual-Bellosta, Ana M., Ortega-Lucea, Sonia M., Santero-Ramirez, Maria P., Duque-Mallen, Maria V., Aragon-Benedi, Cristian, Vallejo-Tarrat, Andrea, Colillas-Calvet, Carmen, Laso, Maria J., Martinez-Cabañero, Javier, Hernández-Salván, Javier, Ledesma-Muñoz, Beatriz, Ochoa-Osorio, Carolina, Sanz-García, Máximo, Herrero-Garrote, Begoña, Blázquez-Martin, Alma, Díez-Alonso, Manuel, Hernández-Juara, Pilar, Muguerza-Huguet, José M., Barbero-Mielgo, Macarena, SAN-Antonio-SAN-Román, Belén, Alonso-Aguilar, Laura, Molnar, Viktoria, Delgado-Naviero, María C., Meléndez-Leal, Encarnación, Cavero-García, Virginia, Fernández-Sánchez, África, Cubek-Quevedo, Daniela A., Munar, Rocío D.Í.E.Z., Blázquez-Fernández-DE-LA Pradilla, Francisco J., Serrano, Ana B., Balvís, Alberto, Berruezo, Alberto, Esparza, Elena, HOZ, Inés D.E.L.A., Palavicini, Ana, Pereira, Lucia, Vega, Ximena, Villahoz, Judith, Villanueva, Gema, Alonso-Fernández, José I., Aldecoa, César, Bolaño-Pérez, Clara, Villán-González, Teresa, Batalla, Astrid, Azparren, G., Basttita, M., Felipe, M., Cueva, L., Gine, Marta, Gómez-Caro, A.M., India, I., Piñol, S., Esteve-Pérez, Neus, Mora-Fernández, Carlos, Ferrer-Robles, Ana, Segura-Sampedro, Juan J., Alonso-Hernández, Natalia, Camps-Cervantes, Angels, Chocrón-DA-Prat, Ivette, Coronado-Silva, Carolina C., Duque-Santos, Héctor, Esclapez-Sempere, Elena, Galan-Menéndez, Patricia, Matarín-Olmo, Silvia, Tormos-Pérez, M.P., Villarino-Villa, Laura, Bergés-Gutiérrez, Héctor, Aisa-Gasca, Miguel, Arbona-Camillero, Verónica, Bautista-González, José D., Carballido-Pascual, Francisco J., Gutiérrez-Moreno, Mercedes, Muñoz-Durán, Ana, Cañete-Gómez, Jesús, Cáceres-Fabrega, Esther, Lorente-Herce, José M., Mulet-Zayas, Octavio, Gómez-Pérez, Rocío, Monje-Salazar, Cristina, Lobato-Bancalero, Luis, Torres-Moreno, Carmelo, Sanchez-Cárdenas, Elena, Daza-González, Juan J., Sanchez-Viguera, Teresa, DEL-Fresno-Asensio, Antonio, Bermudez-Román, Laura, Jover-Pinillos, José L., Orts-Micó, Francisco J., Cózar-Lozano, Coral, Blasco-Delgado, Olga, Nonnemacher-SAN-Julián, Andrea, Pérez, José A., Cruces, Laura D.U.R.Á.N., Renedo-Corcóstegui, Pablo, Zorrilla-Vaca, Andres, Stone, Alexander B., Ripolles-Melchor, Javier, Ramirez-Rodriguez, Jose M., Galan-Menendez, Patricia, Mena, Gabriel E., and Grant, Michael C.

Published
2021
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10. Layer-resolved vector magnetometry using generalized magneto-optical ellipsometry.

Author

Martín Valderrama, Carmen, Prieto, Irene, Quintana, Mikel, Martínez-de-Guerenu, Ane, and Berger, Andreas

Subjects
ELLIPSOMETRY, MAGNETIZATION, MAGNETIC anisotropy, ANISOTROPY
Abstract

We demonstrate the ability of a single magneto-optical reflection experiment to achieve layer-resolved vector magnetometry in multilayer films. For this purpose, we designed, fabricated, and measured a set of epitaxial ferromagnetic/non-magnetic/ferromagnetic heterostructure multilayer samples that exhibit in-plane uniaxial anisotropy and a tunable ferromagnetic interlayer coupling strength through the non-magnetic interlayer. By means of generalized magneto-optical ellipsometry measurements, we obtain the magnetization angles of the two different ferromagnetic layers independently as a function of the applied field. Hereby, we observe that the magnetization switching of one layer can trigger a discontinuous shift of the magnetization angle in the second layer if ferromagnetic interlayer coupling is present. Moreover, we reproduce the obtained behavior using a model of two coupled macrospins, which corroborates even the unexpected aspects of our experimental results and thus reinforces the sensitivity and reliability of our experimental layer-resolved vector magnetometry. [ABSTRACT FROM AUTHOR]

Published
2024
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13. Grinding burn detection via magnetic barkhausen noise analysis independently of induction hardened depth

Author

Gurruchaga-Echeverria, K. (Kizkitza), Lasaosa-Beguiristain, A. (Aitor), Artetxe, I. (Itsaso), and Martínez-de-Guerenu, A. (Ane)

Subjects
Induction hardened layer, Hardened layer depth, Excitation frequency, Área de Ciencia y Tecnología de Materiales, Grinding burn, Magnetic Barkhausen noise
Abstract

The electromagnetic technique based on magnetic Barkhausen noise (MBN) can be used to control the quality of ball screw shafts non-destructively, although identifying any slight grinding burns independently of induction-hardened depth remains a challenge. The capacity to detect slight grinding burns was studied using a set of ball screw shafts manufactured by means of different induction hardening treatments and different grinding conditions (some of them under abnormal conditions for the purpose of generating grinding burns), and MBN measurements were taken in the whole group of ball screw shafts. Additionally, some of them were tested using two different MBN systems in order to better understand the effect of the slight grinding burns, while Vickers microhardness and nanohardness measurements were taken in selected samples. To detect the grinding burns (both slight anddata intense) with varying depths of the hardened layer, a multiparametric analysis of the MBN signal is proposed using the main parameters of the MBN two-peak envelope. At first, the samples are classified into groups depending on their hardened layer depth, estimated using the intensity of the magnetic field measured on the first peak (H1) parameter, and the threshold functions of two parameters (the minimum amplitude between the peaks of the MBN envelope (MIN) and the amplitude of the second peak (P2)) are then determined to detect the slight grinding burns for the different groups.

Published
2023

15. Interpretation of the magnetic susceptibility behaviour of soft carbon steels based on the scaling theory of second order phase transitions for systems with supercritical disorder

Author

A. Skarlatos, A. Martínez-de-Guerenu, D.J. Badiola, I. Lelidis, Département Imagerie et Simulation pour le Contrôle (DISC), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Basque Research and Technology Alliance (BRTA), and National and Kapodistrian University of Athens (NKUA)

Subjects
[PHYS]Physics [physics], Condensed Matter Physics, Electronic, Optical and Magnetic Materials
Abstract

International audience; The experimental magnetic susceptibility curves of several soft steel grades, like interstitial free (IF) or low carbon (LC) steels, can be interpreted within the framework of universal scaling functions obtained for systems with quenched disorder, such as the one described by the random field Ising model with supercritical disorder. Mean-field theory (both scalar and site-dependent) is used to explore the behaviour at the proximity of the coercive field, and explicit expressions are derived. As a result, the susceptibility values close to the coercive field can be approximated to a good extend by a Lorentzian function. Theoretical results are compared against a number of experimental curves obtained from interstitial free (IF) and extra low carbon (ELC) steels subjected to isothermal annealing.

Published
2022
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18. Interpretation of the magnetic susceptibility behaviour of soft carbon steels based on the scaling theory of second order phase transitions for systems with supercritical disorder

Author

Skarlatos, A. Martínez-de-Guerenu, A. Badiola, D.J. Lelidis, I. and Skarlatos, A. Martínez-de-Guerenu, A. Badiola, D.J. Lelidis, I.

Abstract

The experimental magnetic susceptibility curves of several soft steel grades, like interstitial free (IF) or low carbon (LC) steels, can be interpreted within the framework of universal scaling functions obtained for systems with quenched disorder, such as the one described by the random field Ising model with supercritical disorder. Mean-field theory (both scalar and site-dependent) is used to explore the behaviour at the proximity of the coercive field, and explicit expressions are derived. As a result, the susceptibility values close to the coercive field can be approximated to a good extend by a Lorentzian function. Theoretical results are compared against a number of experimental curves obtained from interstitial free (IF) and extra low carbon (ELC) steels subjected to isothermal annealing. © 2022 Elsevier B.V.

Published
2022

19. Grinding Burn Detection via Magnetic Barkhausen Noise Analysis Independently of Induction Hardened Depth

Author

Kizkitza Gurruchaga, Aitor Lasaosa, Itsaso Artetxe, and Ane Martínez-de-Guerenu

Subjects
magnetic Barkhausen noise, grinding burn, induction hardened layer, hardened layer depth, excitation frequency, General Materials Science
Abstract

The electromagnetic technique based on magnetic Barkhausen noise (MBN) can be used to control the quality of ball screw shafts non-destructively, although identifying any slight grinding burns independently of induction-hardened depth remains a challenge. The capacity to detect slight grinding burns was studied using a set of ball screw shafts manufactured by means of different induction hardening treatments and different grinding conditions (some of them under abnormal conditions for the purpose of generating grinding burns), and MBN measurements were taken in the whole group of ball screw shafts. Additionally, some of them were tested using two different MBN systems in order to better understand the effect of the slight grinding burns, while Vickers microhardness and nanohardness measurements were taken in selected samples. To detect the grinding burns (both slight anddata intense) with varying depths of the hardened layer, a multiparametric analysis of the MBN signal is proposed using the main parameters of the MBN two-peak envelope. At first, the samples are classified into groups depending on their hardened layer depth, estimated using the intensity of the magnetic field measured on the first peak (H1) parameter, and the threshold functions of two parameters (the minimum amplitude between the peaks of the MBN envelope (MIN) and the amplitude of the second peak (P2)) are then determined to detect the slight grinding burns for the different groups.

Published
2023
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22. Analysis of the voltage drop across the excitation coil for magnetic characterization of skin passed steel samples

Author

Artetxe, I. (Itsaso), Arizti, F. (Fernando), and Martínez-de-Guerenu, A. (Ane)

Subjects
Skin pass, Distortion analysis, Electromagnetic measurements, Non-destructive testing, Permeability, Hysteresis loops
Abstract

The distortion analysis of magnetic excitation (DAME) method has been recently proposed to facilitate magnetic measurements for non-destructive testing in which pick-up coils are not necessary. This method is based on the distortion effect that the permeability of the sample generates on the voltage across the excitation coil. The aims of the method presented in the present paper are to amplify this distortion effect using a current mode-controlled magnetization and to extract a distortion signal, of high signal-to-noise ratio (SNR), from the voltage measured in the excitation coil by means of a demodulation technique. This methodology is applied to different skin passed steels to characterize the elongation level, which is still a challenge for conventional non-destructive electromagnetic techniques. The relationships between the parameters derived from the distortion and from the hysteresis are studied. Measurements according to the DAME method are performed to verify the improvement in sensitivity for magnetic characterization.

Published
2021

25. Quantitative estimation of nonmonotonic residual stress depth-profiles using an extended Kypris-Jiles model of the magnetic Barkhausen noise spectrum.

Author

Lasaosa, Aitor, Gurruchaga, Kizkitza, Arizti, Fernando, and Martínez-de-Guerenu, Ane

Subjects
RESIDUAL stresses, MAGNETIC noise, BARKHAUSEN effect, MATERIAL plasticity, PHASE transitions, MAGNETIC fields
Abstract

Using nondestructive techniques to quantitatively estimate residual stresses along the depth is necessary to improve the ability to predict the real fatigue life of pieces for many applications. Magnetic Barkhausen noise has been proven to successfully estimate the residual stress at the surface produced by machining, plastic deformation, phase transformation or surface treatments such as shot peening, also allowing one to obtain information of the residual stress depth-profile in shot peened pieces which presented similar depth-profile shapes. However, residual stress depth-profiles with nonmonotonic or different shapes have not been successfully estimated. In the present study, an extended approach is developed in order to estimate these stresses independent of the shape of the residual stress depth-profile. The approach proposed here improves an existing model of the Barkhausen noise spectrum (Kypris-Jiles model) by adding the effect of the attenuation of the applied magnetic field on the Barkhausen noise. This extended approach is used to estimate the residual stress depth-profiles of samples with different depth-profiles using a calibration process. The approach is validated by estimating the residual stress depth-profiles, with errors smaller than 70 MPa in a depth of 130 μm, in all the samples studied. [ABSTRACT FROM AUTHOR]

Published
2018
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26. Insertion layer magnetism detection and analysis using transverse magneto-optical Kerr effect (T-MOKE) ellipsometry

Author

A. Martínez-de-Guerenu, Yuichiro Kurokawa, Yuki Hamada, Carmen Martín Valderrama, Mikel Quintana, Andreas Berger, Tomoki Yamauchi, and Hiromi Yuasa

Subjects
Materials science, Kerr effect, Acoustics and Ultrasonics, Condensed matter physics, Magnetism, Phase (waves), Physics::Optics, Observable, Condensed Matter Physics, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Condensed Matter::Materials Science, Transverse plane, Magneto-optic Kerr effect, Ferromagnetism, Ellipsometry
Abstract

This experimental study demonstrates that with transverse magneto-optical Kerr effect (T-MOKE) ellipsometry, it is possible to determine the magneto-optical and magnetic properties of insertion layers, even if they are superimposed onto much bigger magnetic signals from the surrounding structure. Hereby, it turns out to be especially valuable that with T-MOKE ellipsometry one has full and precise quantitative access to the complex value of the magneto-optical reflection matrix component β, because small magneto-optical insertion layer signals do not necessarily increase the absolute size of β, but can lead to observable phase changes of this complex quantity instead. We demonstrate the ability of T-MOKE ellipsometry to detect such small effects precisely and hereby allow for an accurate determination of the alloy concentration dependent onset of ferromagnetism in ultrathin CoxRu1-x insertion layers, that are embedded into a much thicker ferromagnetic structure. In addition, a detailed and quantitative signal analysis allowed us to demonstrate that all CoRu insertion layers in our samples exhibits a magnetization reversal behavior that is independent from the adjacent Y3Fe5O12 (YIG) layers, clearly indicating that both magnetic entities are either not or only very weakly coupled.

Published
2021
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29. Insertion layer magnetism detection and analysis using transverse magneto-optical Kerr effect (T-MOKE) ellipsometry.

Author

Valderrama, Carmen Martín, Quintana, Mikel, Martínez-de-Guerenu, Ane, Yamauchi, Tomoki, Hamada, Yuki, Kurokawa, Yuichiro, Yuasa, Hiromi, and Berger, Andreas

Subjects
KERR magneto-optical effect, ELLIPSOMETRY, MAGNETOOPTICS, MAGNETISM, MAGNETIZATION reversal, MAGNETIC properties, FERROMAGNETISM
Abstract

This experimental study demonstrates that with transverse magneto-optical Kerr effect (T-MOKE) ellipsometry, it is possible to determine the magneto-optical and magnetic properties of insertion layers, even if they are superimposed onto much larger magnetic signals from the surrounding structure. Hereby, it turns out to be especially valuable that with T-MOKE ellipsometry one has full and precise quantitative access to the complex value of the magneto-optical reflection matrix component , because small magneto-optical insertion layer signals do not necessarily increase the absolute size of , but can lead to observable phase changes of this complex quantity instead. We demonstrate the ability of T-MOKE ellipsometry to precisely detect such small effects and hereby allow for an accurate determination of the alloy concentration dependent onset of ferromagnetism in ultrathin CoxRu1−x insertion layers, that are embedded into a much thicker ferromagnetic structure. In addition, a detailed and quantitative signal analysis allowed us to demonstrate that the CoxRu1−x insertion layers in our samples exhibit a magnetization reversal behavior that is independent of the adjacent Y3Fe5O12 layers, clearly indicating that both magnetic entities are either not or only very weakly coupled. [ABSTRACT FROM AUTHOR]

Published
2021
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32. Ultrasensitive transverse magneto-optical Kerr effect measurements using an effective ellipsometric detection scheme

Author

I Artetxe, A Garcia-Manso, F. Arizti, A. Martínez-de-Guerenu, Andreas Berger, Patricia Riego, and Eva Oblak

Subjects
Transverse plane, Optics, Materials science, Acoustics and Ultrasonics, Magneto-optic Kerr effect, business.industry, Condensed Matter Physics, business, Magnetic thin film, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials
Published
2020
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33. Characterisation of In-Depth Stress State by Magnetic Barkhausen Noise on Machined Steel Acquiring Different Frequency Bands

Author

A. Martínez-de-Guerenu, Kizkitza Gurruchaga, Aitor Lasaosa, and Virginia García Navas

Subjects
Stress (mechanics), Materials science, Residual stress, Frequency band, Magnetic barkhausen noise, Metallurgy, General Engineering, Composite material, Signal, Radio spectrum, Magnetic field
Abstract

The use of magnetic Barkhausen noise (MBN) signal to non-destructively characterize the in-depth residual stress state of machined steel was investigated. The effect of the frequency of the magnetic field applied and of analysing the resulting MBN signal in different frequency bands for an in-depth residual stress characterisation is discussed. The effect of the residual stress on each of the parameters derived from the MBN signal is analysed comparing with the result of the XRD method.

Published
2014
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34. Colaboradores

Author

Fernández, Luis Aguilella, Laakso, Raúl Barco, Baiges, Eduardo Blanco, Heredero, Julio de las Heras Sánchez, Gutiérrez, Miguel del Cerro, PhD, Francisco García-Muro San José, Sanz, Fernando García, López, Rafael Jácome, Cabrero, Jose Luis Lara, Sola, Pedro Marquina, Ferrero, Miguel Ángel Martín, Álvarez, Sergio Martínez, Villanueva, María de Oro Martínez de Guereñu, Nuñez, Nagore Mendiolagaray, Scheker, Luis, de Miguel, Paúl Sierra García, Pérez, Clarisa Simón, and Picado, Alfonso Vaquero

Published
2024
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35. Quantitative magneto-optical characterization of diffusive reflected light from rough steel samples.

Author

González-Díaz, J. B., Arregi, J. A., Martínez-de-Guerenu, A., Arizti, F., and Berger, A.

Subjects
SIGNAL-to-noise ratio, INFORMATION measurement, MAGNETIC hysteresis, OPTICAL polarization, ELECTROMAGNETIC induction
Abstract

We obtain angular-resolved quantitative magneto-optical measurements with good signal-to-noise ratio from very diffusive reflection patterns of industrial steel samples, which are a consequence of their large surface roughness. For the diffuse spots generated by these samples, we observe that while the overall shape of the magnetic hysteresis loop is nearly independent, a monotonous increase of the magneto-optical polarization change occurs as a function of the scattering angle. We demonstrate that this observation can be explained by considering the diffuse spot as a superposition of independent reflections from planar surfaces with varying incidence angles. This main finding can be ultimately used to facilitate an efficient non-invasive analysis of industrial magnetic samples by means of magneto-optical methods despite their elevated level of roughness. [ABSTRACT FROM AUTHOR]

Published
2013
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36. Induction Hardened Layer Characterization and Grinding Burn Detection by Magnetic Barkhausen Noise Analysis

Author

F. Arizti, Kizkitza Gurruchaga, Aitor Lasaosa, and A. Martínez-de-Guerenu

Subjects
010302 applied physics, Engineering drawing, Materials science, Mechanical Engineering, Induction hardening, Ball screw, 01 natural sciences, Indentation hardness, Signal, Magnetic field, Grinding, Mechanics of Materials, 0103 physical sciences, Solid mechanics, Composite material, Envelope (mathematics), 010301 acoustics
Abstract

The quality of the ball screw shafts used in the aeronautical sector has to be controlled and certified with the most advanced non-destructive techniques. The capacity of magnetic Barkhausen noise (MBN) as a non-destructive technique to control the quality of ball screw shafts by assuring the appropriate induction hardened layer depth and detecting local overheated regions, known as grinding burns, which may occur during grinding processes is shown in the present work. Magnetic Barkhausen noise measurements were made with a system designed and implemented by the authors and the derived parameters were compared with microhardness measurements made at various depths after the different induction hardening treatments and the grinding processes were applied. A multiparametric study of the MBN signal as a function of the magnetic field in the surface of the sample is done in order to estimate the thickness of the hardened layer and to detect the grinding burns produced during grinding processes. The hardened layer thickness can be characterized with an error of ±200 \(\upmu \)m in the range between 150 and 2500 \(\upmu \)m by the position of the first peak of the MBN envelope in terms of the tangential magnetic field measured at the surface and the grinding burns can be detected with the position of the second peak of the MBN envelope in terms of the tangential magnetic field measured at the surface.

Published
2017
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37. Magnetic Barkhausen Noise for Characterization of Recovery and Recrystallization

Author

F. Arizti, Kizkitza Gurruchaga, M. Soto, and A. Martínez-de-Guerenu

Subjects
Materials science, Carbon steel, Annealing (metallurgy), Recrystallization (metallurgy), engineering.material, Microstructure, Grain size, Electronic, Optical and Magnetic Materials, symbols.namesake, Ferromagnetism, symbols, engineering, Electrical and Electronic Engineering, Composite material, Barkhausen effect, Softening
Abstract

The capacity of magnetic Barkhausen noise (MBN) measurements to characterize recovery and the onset and evolution of recrystallization processes occurring during the annealing of cold rolled low carbon steel is analyzed. Cold rolled low carbon steel samples were isothermally annealed at laboratory under different conditions in order to promote various degrees of recovery or recrystallization. The effect of recovery and recrystallization processes on the MBN envelope, the amplitude of the peak of the MBN envelope, the time integral of the MBN envelope and the MBN energy is discussed and related to the microstructural changes produced by these softening processes. The obtained results prove that several parameters derived from the MBN are able to follow the progress of recovery and recrystallization.

Published
2010
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38. Efficacy of Magnetic Inductive Parameters for Annealing Characterization of Cold Rolled Low Carbon Steel

Author

F. Arizti, M. Soto, A. Martínez-de-Guerenu, and K. Gurruchaga

Subjects
Materials science, Carbon steel, Annealing (metallurgy), Recrystallization (metallurgy), engineering.material, Magnetic hysteresis, Grain size, Electronic, Optical and Magnetic Materials, Magnetic anisotropy, Remanence, engineering, Grain boundary, Electrical and Electronic Engineering, Composite material
Abstract

The evolution of magnetic inductive parameters during the annealing of a cold rolled low carbon steel is examined in order to analyze whether these hysteresis parameters can be useful to nondestructively characterize recovery and recrystallization processes. Unlike the induction values measured at 2500 A/m (B25) , the remanent induction (Br) values are useful to characterize the decrease in the dislocation density during recovery. As a consequence of recrystallization a weakening of alpha fiber texture and an enhancement of gamma fiber texture components take place. The effect of these textural changes on the magnetic magnetocrystalline energy is analyzed and the observed magnetic response is discussed in terms of this variation. Although Br and B25 can be used to monitor recrystallization in the studied steel, B25 values are more sensitive due to the significant effect that textural changes during recrystallization have at high induction values.

Published
2008
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40. Application of Coercive Field Measurements to the Evaluation of Recovery and Recrystallization in Cold Rolled Interstitial Free (IF) Steel

Author

A. Martínez-de-Guerenu, M. Oyarzabal, F. Arizti, and Isabel Gutiérrez

Subjects
Materials science, Mechanics of Materials, Annealing (metallurgy), Mechanical Engineering, Metallurgy, Isothermal annealing, Kinetics, Metallography, Recrystallization (metallurgy), General Materials Science, Coercivity, Condensed Matter Physics, Indentation hardness
Abstract

The recovery and recrystallization kinetics of a cold rolled interstitial free (IF) steel were studied during isothermal annealing. Magnetic methods based on coercive field measurements, hardness tests and metallography were applied so as to follow the kinetics experimentally. The coercive field measurement technique reveals a higher degree of resolution for monitoring recovery than conventional hardness determination and also allows the recrystallization progress to be monitored. The results obtained are compared to those previously determined for a non-stabilized extra low carbon (ELC) steel. The observed differences are discussed in terms of the presence of microalloying elements, Ti and Nb, which slow down recovery and delay recrystallization.

Published
2005
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41. Determination of the Recovery Kinetics during the Annealing of Cold Rolled Low Carbon Steels

Author

A. Martínez-de-Guerenu, Isabel Gutiérrez, and F. Arizti

Subjects
Materials science, Carbon steel, Annealing (metallurgy), Mechanical Engineering, Kinetics, Metallurgy, Recrystallization (metallurgy), Coercivity, engineering.material, Condensed Matter Physics, Linear relationship, Mechanics of Materials, engineering, Hardening (metallurgy), General Materials Science
Abstract

A cold rolled low carbon steel has been annealed at sufficiently low temperatures (300 to 500 °C) in order to promote recovery without interaction with recrystallization. The recovery kinetics has been followed by using magnetic coercive field (Hc) measurements. The microstructural changes associated with the observed decrease in Hc, produced by the recovery, have been analysed by TEM observations. The experimental data have been adequately modelled using various formulations reported in the literature. The kinetics of the dislocation hardening contribution to the yield stress has been derived from the kinetics of the coercive field, taking into account the existing linear relationship between both variables.

Published
2004
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42. Ultrasensitive transverse magneto-optical Kerr effect measurements by means of effective polarization change detection

Author

F. Arizti, Lorenzo Fallarino, Patricia Riego, Eva Oblak, Andreas Berger, and A. Martínez-de-Guerenu

Subjects
Materials science, Kerr effect, Acoustics and Ultrasonics, business.industry, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Polarization (waves), 01 natural sciences, Varying thickness, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Transverse plane, Optics, Magneto-optic Kerr effect, 0103 physical sciences, 010306 general physics, 0210 nano-technology, business, Change detection
Abstract

We perform a detailed comparative study of conventional transverse magneto-optical Kerr effect (T-MOKE) measurements and a methodology that utilizes an effective polarization detection scheme for mixed s- and p-polarized incoming light. To test the ultimate sensitivity of both methods, we also design a series of specialized samples in which the T-MOKE signal of a Co-film is artificially reduced by means of a Ag overcoat of varying thickness. We find that the effective polarization detection scheme leads to a more than 30-fold increase of the T-MOKE signal and signal-to-noise ratio, even under general operation conditions which were not individually optimized. This allowed for the observation of T-MOKE hysteresis loops of Co-films that were buried under 80 nm of Ag, for which the MOKE signal was only 1/600 of that for an uncoated Co-film. In comparison, conventional T-MOKE measurements did not succeed for Ag overcoats thicker than 40 nm.

Published
2017
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43. A Completely Configurable Digital System for Simultaneous Measurement of Hysteresis Loops and Barkhausen Noise

Author

A. Martínez-de-Guerenu, F. Arizti, M. Soto, and Kizkitza Gurruchaga

Subjects
Engineering, Signal processing, Materials science, Noise measurement, business.industry, Acoustics, Magnetic hysteresis, Signal, Electromagnetic induction, Hysteresis, symbols.namesake, Nondestructive testing, Electronic engineering, symbols, Electrical and Electronic Engineering, business, Instrumentation, Digital filter, Barkhausen effect
Abstract

This paper describes a new accurate completely digital configurable computer-aided system for the simultaneous measurements of magnetic hysteresis loops and Barkhausen noise in a wide range of excitation frequencies (from 0.01 to 80 Hz) for the purposes of inspection of material properties and microstructure characterization. The importance of the correct choice of the data-acquisition (DAQ) card to have enough resolution in both hysteresis loop and magnetic Barkhausen noise (MBN) measurements is emphasized. Both the magnetic induction signal to construct the magnetic hysteresis loop and the Barkhausen noise are computed by the digital processing (numerical integration and digital filtering, respectively) of the induced electromotive force (EMF) signal. The accuracy of the hysteresis loop measurements is improved by using additional digital filters. The resolution of MBN results in simultaneous measurements is tested. Finally, some results of hysteresis loops and root-mean-square (RMS) envelopes of the MBN signal are presented to show the capability of the system to work at different excitation frequencies without changing any hardware.

Published
2008
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44. Sensing in coin discriminators

Author

Antonio J. Lopez-Martin, J.L. Pina-Insausti, Alfonso Carlosena, F. Arizti, A. Martínez-de-Guerenu, J.M. Garcia-Sayes, Universidad Pública de Navarra. Departamento de Ingeniería Eléctrica y Electrónica, and Nafarroako Unibertsitate Publikoa. Ingeniaritza Elektriko eta Elektronikoa Saila

Subjects
Engineering, Discriminator, business.industry, Emphasis (telecommunications), Electrical engineering, Coin discriminators, Data fusion, Sensor fusion, Electromagnetic sensors, Electronic engineering, Electromagnetic devices, Impact sensors, business, Acoustic sensors
Abstract

This paper describes the technologies used in coin discriminator devices, stressing the improvements and novel mechanisms introduced by the authors in the past few years as a result of the cooperation with one leading company in the vending sector. Emphasis is put on how low-cost sensors are used to characterize coins (or tokens) and discriminate them from their counterfeits. Partial support from the Spanish Dirección General de Investigación and FEDER under grant DPI2003-08637-C03-01 is acknowledged.

Published
2007

45. Quantitative magneto-optical characterization of diffusive reflected light from rough steel samples

Author

A. Martínez-de-Guerenu, Jon Ander Arregi, F. Arizti, J. B. González-Díaz, and Andreas Berger

Subjects
Superposition principle, Optics, Materials science, Scattering, business.industry, Surface roughness, Reflection (physics), General Physics and Astronomy, Surface finish, business, Polarization (waves), Magnetic hysteresis, Light scattering
Abstract

We obtain angular-resolved quantitative magneto-optical measurements with good signal-to-noise ratio from very diffusive reflection patterns of industrial steel samples, which are a consequence of their large surface roughness. For the diffuse spots generated by these samples, we observe that while the overall shape of the magnetic hysteresis loop is nearly independent, a monotonous increase of the magneto-optical polarization change occurs as a function of the scattering angle. We demonstrate that this observation can be explained by considering the diffuse spot as a superposition of independent reflections from planar surfaces with varying incidence angles. This main finding can be ultimately used to facilitate an efficient non-invasive analysis of industrial magnetic samples by means of magneto-optical methods despite their elevated level of roughness.

Published
2013
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47. A Completely Configurable Digital System for Simultaneous Measurements of Hysteresis Loops and Barkhausen Noise.

Author

Soto, Miguel, Martínez-de-Guerenu, Ane, Gurruchaga, Kizkitza, and Arizti, Fernando

Subjects
MEASUREMENT, HYSTERESIS loop, BARKHAUSEN effect, MATERIALS testing, MATERIALS science, MICROSTRUCTURE, DIGITAL electronics, MAGNETIC fields
Abstract

This paper describes a new accurate completely digital configurable computer-aided system for the simultaneous measurements of magnetic hysteresis loops and Barkhausen noise in a wide range of excitation frequencies (from 0.01 to 80 Hz) for the purposes of inspection of material properties and microstructure characterization. The importance of the correct choice of the data-acquisition (DAQ) card to have enough resolution in both hysteresis loop and magnetic Barkhausen noise (MBN) measurements is emphasized. Both the magnetic induction signal to construct the magnetic hysteresis loop and the Barkhausen noise are computed by the digital processing (numerical integration and digital filtering, respectively) of the induced electromotive force (EMF) signal. The accuracy of the hysteresis loop measurements is improved by using additional digital filters. The resolution of MBN results in simultaneous measurements is tested. Finally, some results of hysteresis loops and root-mean-square (RMS) envelopes of the MBN signal are presented to show the capability of the system to work at different excitation frequencies without changing any hardware. [ABSTRACT FROM AUTHOR]

Published
2009
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48. Efficacy of Magnetic Inductive Parameters for Annealing Characterization of Cold Rolled Low Carbon Steel.

Author

Gurruchaga, Kizkitza, Martínez-de-Guerenu, Ane, Soto, Miguel, and Arizti, Fernando

Subjects
ELECTROMAGNETIC induction, MAGNETIC fields, ANNEALING of crystals, CARBON steel, HYSTERESIS
Abstract

The evolution of magnetic inductive parameters during the annealing of a cold rolled low carbon steel is examined in order to analyze whether these hysteresis parameters can be useful to nondestructively characterize recovery and recrystallization processes. Unlike the induction values measured at 2500 A/m (B25),the remanent induction (Br) values are useful to characterize the decrease in the dislocation density during recovery. As a consequence of recrystallization a weakening of α fiber texture and an enhancement of γ fiber texture components take place. The effect of these textural changes on the magnetic magnetocrystalline energy is analyzed and the observed magnetic response is discussed in terms of this variation. Although Br and B25 can be used to monitor recrystallization in the studied steel, B25 values are more sensitive due to the significant effect that textural changes during recrystallization have at high induction values. [ABSTRACT FROM AUTHOR]

Published
2008
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49. Ultrasensitive transverse magneto-optical Kerr effect measurements using an effective ellipsometric detection scheme.

Author

E Oblak, P Riego, A Garcia-Manso, A Martínez-de-Guerenu, F Arizti, I Artetxe, and A Berger

Subjects
KERR magneto-optical effect, SURFACE analysis, SIGNAL sampling, KERR electro-optical effect, ELECTROCHEMILUMINESCENCE
Abstract

We present a new methodology that enables a significant sensitivity improvement for transverse magneto-optical Kerr effect (T-MOKE) detection. For this purpose, we developed a novel measurement scheme, in which the polarization detection conditions are changed during the measurement sequence in a pre-defined way. An analytical expression of the associated T-MOKE signal pattern was derived, which allowed us to analyze and classify our experimental data in a straightforward way. Furthermore, this new measurement approach enables the identification of noise and false background signals that might be generated by the sample under investigation, the environment or the detection system itself and it provides a pathway to unambiguously separate all these effects from true T-MOKE signals. These capabilities significantly increase the sensitivity and robustness of T-MOKE detection. The method enabled us to measure magneto-optical signals for samples that are paramagnetic at room temperature or exhibit really small magneto-optical responses, even in the presence of false signals that were far larger in size. Our new methodology was integrated into a scanning wafer tool, which allows for nondestructive, laterally resolved surface characterization measurements and even has the capability of measuring optical and magneto-optical properties simultaneously. [ABSTRACT FROM AUTHOR]

Published
2020
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50. Sensitivity of conventional and non-destructive characterization techniques to recovery and recrystallization

Author

Isabel Gutiérrez, A. Martínez-de-Guerenu, Kizkitza Gurruchaga, and Maite Oyarzábal

Subjects
Diffraction, Materials science, Carbon steel, Annealing (metallurgy), Mechanical Engineering, Metals and Alloys, Recrystallization (metallurgy), Mineralogy, Electron, Coercivity, engineering.material, Mechanics of Materials, Non destructive, Materials Chemistry, engineering, Composite material
Abstract

The sensitivity and limitations of magnetic coercive field, hardness, metallographic measurements and electron back scattered diffraction analysis are studied and discussed in terms of monitoring recovery and the onset and evolution of recrystallization in a cold rolled low carbon steel. The magnetic coercive field shows much higher resolution than hardness measurements when measuring recovery. Hardness is almost insensitive to the microstructural changes taking place in the material during annealing treatments performed at low temperatures. The conditions under which the magnetic coercive field measurements can also be used to monitor recrystallized fraction are also discussed.

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