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Your search keyword '"Quintana, Alberto [0000-0002-9813-735X]"' showing total 5 results
Start Over Author "Quintana, Alberto [0000-0002-9813-735X]" Publisher american chemical society
5 results on '"Quintana, Alberto [0000-0002-9813-735X]"'

1. Robust Antiferromagnetic FeRh Films on Mica

Author

Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), Generalitat de Catalunya, Quintana, Alberto [0000-0002-9813-735X], Dix, Nico [0000-0001-8232-0638], Sánchez Barrera, Florencio [0000-0002-5314-453X], Fina, Ignasi [0000-0003-4182-6194], Fontcuberta, Josep [0000-0002-7955-2320], Quintana, Alberto, Zarco, Carlos, Dix, Nico, Sánchez Barrera, Florencio, Fina, Ignasi, Fontcuberta, Josep, Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), Generalitat de Catalunya, Quintana, Alberto [0000-0002-9813-735X], Dix, Nico [0000-0001-8232-0638], Sánchez Barrera, Florencio [0000-0002-5314-453X], Fina, Ignasi [0000-0003-4182-6194], Fontcuberta, Josep [0000-0002-7955-2320], Quintana, Alberto, Zarco, Carlos, Dix, Nico, Sánchez Barrera, Florencio, Fina, Ignasi, and Fontcuberta, Josep

Abstract

FeRh shows an antiferromagnetic to ferromagnetic phase transition above room temperature, which permits its use as an antiferromagnetic memory element. However, its antiferromagnetic order is sensitive to small variations in crystallinity and composition, challenging its integration into flexible devices. Here, we show that flexible FeRh films of high crystalline quality can be synthesized by using mica as a substrate, followed by a mechanical exfoliation of the mica. The magnetic and transport data indicate that the FeRh films display a sharp antiferromagnetic to ferromagnetic phase transition. Magnetotransport data allow for the observation of two distinguishable resistance states, which are written after a field-cooling procedure. It is shown that the memory states are robust under the application of magnetic fields of up to 10 kOe.

Published
2023

2. From Binary to Ternary Transition-Metal Nitrides: A Boost toward Nitrogen Magneto-Ionics

Author

European Research Council, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Generalitat de Catalunya, KU Leuven, Comunidad de Madrid, Ministerio de Economía y Competitividad (España), Rojas, Julius de [0000-0002-1206-4744], Chshiev, Mairbek [0000-0001-9232-7622], Quintana, Alberto [0000-0002-9813-735X], Menéndez, Enric [0000-0003-3809-2863], Sort, Jordi [0000-0003-1213-3639], Tan, Zhengwei, Martins, Sofia, Escobar, Michael, Rojas, Julius de, Ibrahim, Fatima, Chshiev, Mairbek, Quintana, Alberto, Lopeandía, Aitor, Costa Krämer, José Luis, Menéndez, Enric, Sort, Jordi, European Research Council, European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Generalitat de Catalunya, KU Leuven, Comunidad de Madrid, Ministerio de Economía y Competitividad (España), Rojas, Julius de [0000-0002-1206-4744], Chshiev, Mairbek [0000-0001-9232-7622], Quintana, Alberto [0000-0002-9813-735X], Menéndez, Enric [0000-0003-3809-2863], Sort, Jordi [0000-0003-1213-3639], Tan, Zhengwei, Martins, Sofia, Escobar, Michael, Rojas, Julius de, Ibrahim, Fatima, Chshiev, Mairbek, Quintana, Alberto, Lopeandía, Aitor, Costa Krämer, José Luis, Menéndez, Enric, and Sort, Jordi

Abstract

Magneto-ionics is an emerging actuation mechanism to control the magnetic properties of materials via voltage-driven ion motion. This effect largely relies on the strength and penetration of the induced electric field into the target material, the amount of generated ion transport pathways, and the ionic mobility inside the magnetic media. Optimizing all these factors in a simple way is a huge challenge, although highly desirable for technological applications. Here, we demonstrate that the introduction of suitable transition-metal elements to binary nitride compounds can drastically boost magneto-ionics. More specifically, we show that the attained magneto-ionic effects in CoN films (i.e., saturation magnetization, toggling speeds, and cyclability) can be drastically enhanced through 10% substitution of Co by Mn in the thin-film composition. Incorporation of Mn leads to transformation from nanocrystalline into amorphous-like structures, as well as from metallic to semiconducting behaviors, resulting in an increase of N-ion transport channels. Ab initio calculations reveal a lower energy barrier for CoMn-N compared to Co-N that provides a fundamental understanding of the crucial role of Mn addition in the voltage-driven magnetic effects. These results constitute an important step forward toward enhanced voltage control of magnetism via electric field-driven ion motion.

Published
2022

3. Bendable Polycrystalline and Magnetic CoFe2O4 Membranes by Chemical Methods

Author

Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), European Commission, Fundación BBVA, Consejo Superior de Investigaciones Científicas (España), National Key Research and Development Program (China), Beijing Outstanding Young Scientist Program, La Caixa, Sallés, Pol [0000-0003-1426-611X], Guzmán, Roger [0000-0002-5580-0043], Zanders, David [0000-0001-5516-7738], Quintana, Alberto [0000-0002-9813-735X], Fina, Ignasi [0000-0003-4182-6194], Sánchez Barrera, Florencio [0000-0002-5314-453X], Zhou, Wu [0000-0002-6803-1095], Devi, Anjana [0000-0003-2142-8105], Coll, Mariona [0000-0001-5157-7764], Sallés, Pol, Guzmán, Roger, Zanders, David, Quintana, Alberto, Fina, Ignasi, Sánchez Barrera, Florencio, Zhou, Wu, Devi, Anjana, Coll, Mariona, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), European Commission, Fundación BBVA, Consejo Superior de Investigaciones Científicas (España), National Key Research and Development Program (China), Beijing Outstanding Young Scientist Program, La Caixa, Sallés, Pol [0000-0003-1426-611X], Guzmán, Roger [0000-0002-5580-0043], Zanders, David [0000-0001-5516-7738], Quintana, Alberto [0000-0002-9813-735X], Fina, Ignasi [0000-0003-4182-6194], Sánchez Barrera, Florencio [0000-0002-5314-453X], Zhou, Wu [0000-0002-6803-1095], Devi, Anjana [0000-0003-2142-8105], Coll, Mariona [0000-0001-5157-7764], Sallés, Pol, Guzmán, Roger, Zanders, David, Quintana, Alberto, Fina, Ignasi, Sánchez Barrera, Florencio, Zhou, Wu, Devi, Anjana, and Coll, Mariona

Abstract

The preparation and manipulation of crystalline yet bendable functional complex oxide membranes has been a long-standing issue for a myriad of applications, in particular, for flexible electronics. Here, we investigate the viability to prepare magnetic and crystalline CoFe2O4 (CFO) membranes by means of the Sr3Al2O6 (SAO) sacrificial layer approach using chemical deposition techniques. Meticulous chemical and structural study of the SAO surface and SAO/CFO interface properties have allowed us to identify the formation of an amorphous SAO capping layer and carbonates upon air exposure, which dictate the crystalline quality of the subsequent CFO film growth. Vacuum annealing at 800 °C of SAO films promotes the elimination of the surface carbonates and the reconstruction of the SAO surface crystallinity. Ex-situ atomic layer deposition of CFO films at 250 °C on air-exposed SAO offers the opportunity to avoid high-temperature growth while achieving polycrystalline CFO films that can be successfully transferred to a polymer support preserving the magnetic properties under bending. Float on and transfer provides an alternative route to prepare freestanding and wrinkle-free CFO membrane films. The advances and challenges presented in this work are expected to help increase the capabilities to grow different oxide compositions and heterostructures of freestanding films and their range of functional properties.

Published
2022

4. Voltage-controlled ON-OFF ferromagnetism at room temperature in a single metal oxide film

Author

Agencia Estatal de Investigación (España), European Research Council, Generalitat de Catalunya, Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), European Commission, National Science Foundation (US), Quintana, Alberto [0000-0002-9813-735X], Menéndez, Enric [0000-0003-3809-2863], Dendooven, Jolien [0000-0002-2385-3693], Murray, Peyton D. [0000-0003-0389-0611], Gilbert, Dustin A. [0000-0003-3747-3883], Liu, Kai [0000-0001-9413-6782], Pellicer, Eva [0000-0002-8901-0998], Sort, Jordi [0000-0003-1213-3639], Quintana, Alberto, Menéndez, Enric, Liedke, Maciej O., Butterling, Maik, Wagner, Andreas, Sireus, Veronica, Torruella, Pau, Estradé, Sònia, Peiró, Francesca, Dendooven, Jolien, Detavernier, Christophe, Murray, Peyton D., Gilbert, Dustin A., Liu, Kai, Pellicer, Eva, Nogués, Josep, Sort, Jordi, Agencia Estatal de Investigación (España), European Research Council, Generalitat de Catalunya, Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), European Commission, National Science Foundation (US), Quintana, Alberto [0000-0002-9813-735X], Menéndez, Enric [0000-0003-3809-2863], Dendooven, Jolien [0000-0002-2385-3693], Murray, Peyton D. [0000-0003-0389-0611], Gilbert, Dustin A. [0000-0003-3747-3883], Liu, Kai [0000-0001-9413-6782], Pellicer, Eva [0000-0002-8901-0998], Sort, Jordi [0000-0003-1213-3639], Quintana, Alberto, Menéndez, Enric, Liedke, Maciej O., Butterling, Maik, Wagner, Andreas, Sireus, Veronica, Torruella, Pau, Estradé, Sònia, Peiró, Francesca, Dendooven, Jolien, Detavernier, Christophe, Murray, Peyton D., Gilbert, Dustin A., Liu, Kai, Pellicer, Eva, Nogués, Josep, and Sort, Jordi

Abstract

Electric-field-controlled magnetism can boost energy efficiency in widespread applications. However, technologically, this effect is facing important challenges: mechanical failure in strain-mediated piezoelectric/magnetostrictive devices, dearth of room-temperature multiferroics, or stringent thickness limitations in electrically charged metallic films. Voltage-driven ionic motion (magneto-ionics) circumvents most of these drawbacks while exhibiting interesting magnetoelectric phenomena. Nevertheless, magneto-ionics typically requires heat treatments and multicomponent heterostructures. Here we report on the electrolyte-gated and defect-mediated O and Co transport in a Co3O4 single layer which allows for room-temperature voltage-controlled ON-OFF ferromagnetism (magnetic switch) via internal reduction/oxidation processes. Negative voltages partially reduce Co3O4 to Co (ferromagnetism: ON), resulting in graded films including Co- and O-rich areas. Positive bias oxidizes Co back to Co3O4 (paramagnetism: OFF). This electric-field-induced atomic-scale reconfiguration process is compositionally, structurally, and magnetically reversible and self-sustained, since no oxygen source other than the Co3O4 itself is required. This process could lead to electric-field-controlled device concepts for spintronics.

Published
2018

5. Large magnetoelectric effects in electrodeposited nanoporous microdisks driven by effective surface charging and magneto-ionics

Author

European Research Council, Generalitat de Catalunya, Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), European Commission, Quintana, Alberto [0000-0002-9813-735X], Pellicer, Eva [0000-0002-8901-0998], Sort, Jordi [0000-0003-1213-3639], Navarro-Senent, Cristina, Fornell, Jordina, Isarain-Chávez, Eloy, Quintana, Alberto, Menéndez, Enric, Foerster, Michael, Aballe, Lucía, Weschke, Eugen, Nogués, Josep, Pellicer, Eva, Sort, Jordi, European Research Council, Generalitat de Catalunya, Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), European Commission, Quintana, Alberto [0000-0002-9813-735X], Pellicer, Eva [0000-0002-8901-0998], Sort, Jordi [0000-0003-1213-3639], Navarro-Senent, Cristina, Fornell, Jordina, Isarain-Chávez, Eloy, Quintana, Alberto, Menéndez, Enric, Foerster, Michael, Aballe, Lucía, Weschke, Eugen, Nogués, Josep, Pellicer, Eva, and Sort, Jordi

Abstract

A synergetic approach to enhance magnetoelectric effects (i.e., control of magnetism with voltage) and improve energy efficiency in magnetically actuated devices is presented. The investigated material consists of an ordered array of Co–Pt microdisks, in which nanoporosity and partial oxidation are introduced during the synthetic procedure to synergetically boost the effects of electric field. The microdisks are grown by electrodeposition from an electrolyte containing an amphiphilic polymeric surfactant. The bath formulation is designed to favor the incorporation of oxygen in the form of cobalt oxide. A pronounced reduction of coercivity (88%) and a remarkable increase of Kerr signal amplitude (60%) are observed at room temperature upon subjecting the microdisks to negative voltages through an electrical double layer. These large voltage-induced changes in the magnetic properties of the microdisks are due to (i) the high surface-area-to-volume ratio with ultranarrow pore walls (sub-10 nm) that promote enhanced electric charge accumulation and (ii) magneto-ionic effects, where voltage-driven O2– migration promotes a partial reduction of CoO to Co at room temperature. This simple and versatile procedure to fabricate patterned “nano-in-micro” magnetic motifs with adjustable voltage-driven magnetic properties is very appealing for energy-efficient magnetic recording systems and other magnetoelectronic devices.

Published
2018

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