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1. Tuning the morphology and magnetic properties of single-domain SrFe8Al4O19 particles prepared by citrate auto-combustion route

Author

Sleptsova, Anastasia E., Alyabyeva, Liudmila N., Gorbachev, Evgeny A., Kozlyakova, Ekaterina S., Karpov, Maxim A., Xinming, Chen, Vasiliev, Alexander V., Gorshunov, Boris P., Prokhorov, Anatoly S., Kazin, Pavel E., and Trusov, Lev A.

Subjects
Condensed Matter - Materials Science
Abstract

Single-domain particles of SrFe8Al4O19 were prepared by thermal treatment at 1473 K of porous products of citrate-nitrate auto-combustion, and the influence of synthesis time on the particle morphology and magnetic properties was studied. The procedure allows to obtain SrFe8Al4O19 particles with mean diameters 100 - 460 nm, and their coercivity ranges from 14.5 to 18.4 kOe, while ferromagnetic resonance frequencies vary from 149 to 164 GHz.

Published
2021

5. Hard magnetic colloidal nanoplates with tunable size for magneto-optical applications.

Author

Chen, Jianing, Duan, Jingtong, Anokhin, Evgeny O., Xia, Zitian, Svetogorov, Roman D., Semina, Anastasia A., Nygaard, Roy R., Eliseev, Artem A., Gorbachev, Evgeny A., and Trusov, Lev A.

Abstract

We have synthesized highly anisotropic plate-like nanoparticles of aluminum-substituted strontium hexaferrite via the crystallization of 4Na2O × 9SrO × 5.5Fe2O3 × 4.5Al2O3 × 4B2O3 glass, achieving tunable sizes by adjusting the annealing temperature (650–750 °C). Particle sizes range from 39 nm × 4.5 nm to 90 nm × 7.1 nm. Aluminum substitution significantly increases the coercivity of the colloid particles up to 5600 Oe. These nanoparticles form stable aqueous colloids in the pH range of 2–4. The ferrofluids exhibit a strong "jalousie effect" of adjustable optical transmission in external magnetic fields. The transmission difference rises with increasing nanoplate diameter and anisotropy factor. The high remanence of the hexaferrite particles allows them to be manipulated by weak magnetic fields, providing high-frequency particle motion with available electromagnets. Tunable particle sizes facilitate specific applications: smaller particles offer higher relaxation frequencies and better stability, while larger particles provide superior light scattering and induced mechanical momentum. These properties make the nanoparticles suitable for microfluidic stirring, mechanical impacting for cancer treatment, high-frequency light modulation, optical probing of magnetic fields, and micrometer-scale viscoelasticity sensing. [ABSTRACT FROM AUTHOR]

Published
2024
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14. Synthesis of Sandwiched Composite Nanomagnets by Epitaxial Growth of Fe3O4 Layers on SrFe10Cr2O19 Nanoplates in High-Boiling Organic Solvent

Author

Anokhin, Evgeny O., primary, Deyankov, Danila A., additional, Xia, Zitian, additional, Kozlyakova, Ekaterina S., additional, Lebedev, Vasily A., additional, Morozov, Anatolii V., additional, Kozlov, Daniil A., additional, Nygaard, Roy R., additional, Petukhov, Dmitry I., additional, and Trusov, Lev A., additional

Published
2022
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16. Synthesis of Sandwiched Composite Nanomagnets by Epitaxial Growth of Fe3O4 Layers on Srfe12o19 Nanoplates in High-Boiling Organic Solvent

Author

Anokhin, Evgeny O., Deyankov, Danila A., Xia, Zitian, Kozlyakova, Ekaterina S., Lebedev, Vasily A., Morozov, Anatolii V., Kozlov, Daniil A., Nigaard, Roy R., Petukhov, Dmitry I., and Trusov, Lev A.

Subjects
nanotechnology
Abstract

Herein, we demonstrate the synthesis of sandwiched composite nanomagnets, which consist of hard magnetic hexaferrite cores and magnetite outer layers. The hexaferrite plate-like nanoparticles with average dimensions of 16.0 nm × 4.9 nm were prepared by glass crystallization method and were covered by spinel-type iron oxide via thermal decomposition of iron acetylacetonate in hexadecane solution. The hexaferrite nanoplates act as seeds for the epitaxial growth of the magnetite, which results in uniform continuous outer layers on both sides. The thickness of the layers can be adjusted by controlling the concentration of metal ions. In this way, layers with average thickness of 3.9 and 5.0 nm were obtained. Due to an atomically smooth interface the magnetic composites demonstrate the exchange coupling effect acting as single phases during remagnetization. The developed approach can be applied to any spinel-type material with matching lattice parameters and opens the way to expanding the performance of hexaferrite nanomagnets due to a combination of various functional properties.

Published
2022

19. Correction: High-coercivity hexaferrite ceramics featuring sub-terahertz ferromagnetic resonance

Author

Gorbachev, Evgeny A., primary, Trusov, Lev A., additional, Alyabyeva, Liudmila N., additional, Roslyakov, Ilya V., additional, Lebedev, Vasily A., additional, Kozlyakova, Ekaterina S., additional, Magdysyuk, Oxana V., additional, Sobolev, Alexey V., additional, Glazkova, Iana S., additional, Beloshapkin, Sergey A., additional, Gorshunov, Boris P., additional, and Kazin, Pavel E., additional

Published
2022
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20. High-Coercivity Hexaferrite Ceramics Featuring Sub-Terahertz Ferromagnetic Resonance

Author

Gorbachev, Evgeny Andreevich, primary, Trusov, Lev A., additional, Alyabyeva, Liudmila, additional, Roslyakov, Ilya V., additional, Lebedev, Vasily, additional, Kozlyakova, Ekaterina, additional, Magdysyuk, Oxana V., additional, Sobolev, Alexey V., additional, Glazkova, Iana, additional, Beloshapkin, Sergey, additional, Gorshunov, Boris, additional, and Kazin, Pavel E, additional

Published
2022
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23. Synthesis of Sandwiched Composite Nanomagnets by Epitaxial Growth of Fe 3 O 4 Layers on SrFe 10 Cr 2 O 19 Nanoplates in High-Boiling Organic Solvent.

Author

Anokhin, Evgeny O., Deyankov, Danila A., Xia, Zitian, Kozlyakova, Ekaterina S., Lebedev, Vasily A., Morozov, Anatolii V., Kozlov, Daniil A., Nygaard, Roy R., Petukhov, Dmitry I., and Trusov, Lev A.

Subjects
IRON oxides, EPITAXY, FERRIC oxide, ORGANIC solvents, IRON, IRON oxide nanoparticles
Abstract

Herein, we demonstrate the synthesis of sandwiched composite nanomagnets, which consist of hard magnetic Cr-substituted hexaferrite cores and magnetite outer layers. The hexaferrite plate-like nanoparticles, with average dimensions of 36.3 nm × 5.2 nm, were prepared via a glass crystallization method and were covered by spinel-type iron oxide via thermal decomposition of iron acetylacetonate in a hexadecane solution. The hexaferrite nanoplates act as seeds for the epitaxial growth of the magnetite, which results in uniform continuous outer layers on both sides. The thickness of the layers can be adjusted by controlling the concentration of metal ions. In this way, layers with an average thickness of 3.7 and 4.9 nm were obtained. Due to an atomically smooth interface, the magnetic composites demonstrate the exchange coupling effect, acting as single phases during remagnetization. The developed approach can be applied to any spinel-type material with matching lattice parameters and opens the way to expand the performance of hexaferrite nanomagnets due to a combination of various functional properties. [ABSTRACT FROM AUTHOR]

Published
2023
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25. Tunable order in colloids of hard magnetic hexaferrite nanoplatelets

Author

Eliseev, Artem A., primary, Trusov, Lev A., additional, Anokhin, Evgeny O., additional, Chumakov, Andrei P., additional, Korolev, Vladimir V., additional, Sleptsova, Anastasia E., additional, Boesecke, Peter, additional, Pryakhina, Victoria I., additional, Shur, Vladimir Ya., additional, Kazin, Pavel E., additional, and Eliseev, Andrei A., additional

Published
2021
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26. Spray-Deposited Anisotropic Ferromagnetic Hybrid Polymer Films of PS-b-PMMA and Strontium Hexaferrite Magnetic Nanoplatelets

Author

Cao, Wei, Yin, Shanshan, Plank, Martina, Chumakov, Andrei, Opel, Matthias, Chen, Wei, Kreuzer, Lucas P., Heger, Julian E., Gallei, Markus, Brett, Calvin J., Schwartzkopf, Matthias, Eliseev, Artem A., Anokhin, Evgeny O., Trusov, Lev A., Roth, Stephan V., Mueller-Buschbaum, Peter, Cao, Wei, Yin, Shanshan, Plank, Martina, Chumakov, Andrei, Opel, Matthias, Chen, Wei, Kreuzer, Lucas P., Heger, Julian E., Gallei, Markus, Brett, Calvin J., Schwartzkopf, Matthias, Eliseev, Artem A., Anokhin, Evgeny O., Trusov, Lev A., Roth, Stephan V., and Mueller-Buschbaum, Peter

Abstract

Spray deposition is a scalable and cost-effective technique for the fabrication of magnetic hybrid films containing diblock copolymers (DBCs) and magnetic nanoparticles. However, it is challenging to obtain spray-deposited anisotropic magnetic hybrid films without using external magnetic fields. In the present work, spray deposition is applied to prepare perpendicular anisotropic magnetic hybrid films by controlling the orientation of strontium hexaferrite nanoplatelets inside ultra-high-molecular-weight DBC polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) films. During spray deposition, the evolution of DBC morphology and the orientation of magnetic nanoplatelets are monitored with in situ grazing-incidence small-angle X-ray scattering (GISAXS). For reference, a pure DBC film without nanoplatelets is deposited with the same conditions. Solvent-controlled magnetic properties of the hybrid film are proven with solvent vapor annealing (SVA) applied to the final deposited magnetic films. Obvious changes in the DBC morphology and nanoplatelet localization are observed during SVA. The superconducting quantum interference device data show that ferromagnetic hybrid polymer films with high coercivity can be achieved via spray deposition. The hybrid films show a perpendicular magnetic anisotropy before SVA, which is strongly weakened after SVA. The spray-deposited hybrid films appear highly promising for potential applications in magnetic data storage and sensors., QC 20210323

Published
2021
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27. Glass-Ceramic Synthesis of Cr-Substituted Strontium Hexaferrite Nanoparticles with Enhanced Coercivity

Author

Trusov, Lev A., primary, Sleptsova, Anastasia E., additional, Duan, Jingtong, additional, Gorbachev, Evgeny A., additional, Kozlyakova, Ekaterina S., additional, Anokhin, Evgeny O., additional, Eliseev, Artem A., additional, Karpov, Maxim A., additional, Vasiliev, Alexander V., additional, Brylev, Oleg A., additional, and Kazin, Pavel E., additional

Published
2021
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28. Tuning the morphology and magnetic properties of single-domain SrFe8Al4O19 particles prepared by a citrate auto-combustion method

Author

Sleptsova, Anastasia E., primary, Alyabyeva, Liudmila N., additional, Gorbachev, Evgeny A., additional, Kozlyakova, Ekaterina S., additional, Karpov, Maxim A., additional, Xinming, Chen, additional, Vasiliev, Alexander V., additional, Gorshunov, Boris P., additional, Prokhorov, Anatoly S., additional, Kazin, Pavel E., additional, and Trusov, Lev A., additional

Published
2021
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30. Nanoceramics of metastable -Fe2O3: effect of sintering on the magnetic properties and sub-terahertz electron resonanceElectronic supplementary information (ESI) available. See DOI: https://doi.org/10.1039/d3mh00626c

Author

Gorbachev, Evgeny A., Alyabyeva, Liudmila N., Soshnikov, Miroslav V., Lebedev, Vasily A., Morozov, Anatolii V., Kozlyakova, Ekaterina S., Ahmed, Asmaa, Eliseev, Artem A., and Trusov, Lev A.

Abstract

In this study, we demonstrate the sintering of metastable -Fe2O3nanoparticles into nanoceramics containing 98 wt% of the epsilon iron oxide phase and with a specific density of 60%. At room temperature, the ceramics retain a giant coercivity of 20 kOe and a sub-terahertz absorption at 190 GHz inherent in the initial nanoparticles. The sintering leads to an increase in the frequencies of the natural ferromagnetic resonance at 200–300 K and larger coercivities at temperatures below 150 K. We propose a simple but working explanation of the low-temperature dynamics of the macroscopic magnetic parameters of the -Fe2O3materials viathe transition of the smallest nanoparticles into a superparamagnetic state. The results are confirmed by the temperature dependence of the magnetocrystalline anisotropy constant and micromagnetic modeling. In addition, based on the Landau–Lifshitz formalism, we discuss features of the spin dynamics in -Fe2O3and the possibility of using nanoceramics as sub-terahertz spin-pumping media. Our observations will expand the applicability of -Fe2O3materials and promote their integration into telecommunication devices of the next generation.

Published
2023
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32. Tuning the particle size, natural ferromagnetic resonance frequency and magnetic properties of ε-Fe2O3 nanoparticles prepared by a rapid sol–gel method

Author

Gorbachev, Evgeny, primary, Soshnikov, Miroslav, additional, Wu, Mingxi, additional, Alyabyeva, Liudmila, additional, Myakishev, Dmitrii, additional, Kozlyakova, Ekaterina, additional, Lebedev, Vasilii, additional, Anokhin, Evgeny, additional, Gorshunov, Boris, additional, Brylev, Oleg, additional, Kazin, Pavel, additional, and Trusov, Lev, additional

Published
2021
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33. Submicron particles of Ga-substituted strontium hexaferrite obtained by a citrate auto-combustion method

Author

Gorbachev, Evgeny A., primary, Trusov, Lev A., additional, Wu, Mingxi, additional, Vasiliev, Alexander V., additional, Svetogorov, Roman D., additional, Alyabyeva, Liudmila N., additional, Lebedev, Vasily A., additional, Sleptsova, Anastasia E., additional, Karpov, Maxim A., additional, Mozharov, Yaroslav M., additional, Gorshunov, Boris P., additional, and Kazin, Pavel E., additional

Published
2021
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35. Spray-Deposited Anisotropic Ferromagnetic Hybrid Polymer Films of PS-b-PMMA and Strontium Hexaferrite Magnetic Nanoplatelets

Author

Cao, Wei, primary, Yin, Shanshan, additional, Plank, Martina, additional, Chumakov, Andrei, additional, Opel, Matthias, additional, Chen, Wei, additional, Kreuzer, Lucas P., additional, Heger, Julian E., additional, Gallei, Markus, additional, Brett, Calvin J., additional, Schwartzkopf, Matthias, additional, Eliseev, Artem A., additional, Anokhin, Evgeny O., additional, Trusov, Lev A., additional, Roth, Stephan V., additional, and Müller-Buschbaum, Peter, additional

Published
2020
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42. Tuning the particle size, natural ferromagnetic resonance frequency and magnetic properties of ε-Fe2O3 nanoparticles prepared by a rapid sol–gel method.

Author

Gorbachev, Evgeny, Soshnikov, Miroslav, Wu, Mingxi, Alyabyeva, Liudmila, Myakishev, Dmitrii, Kozlyakova, Ekaterina, Lebedev, Vasilii, Anokhin, Evgeny, Gorshunov, Boris, Brylev, Oleg, Kazin, Pavel, and Trusov, Lev

Abstract

In this study, we demonstrate the synthesis and the investigation of magnetostatic and magnetodynamic properties of epsilon iron oxide (ε-Fe2O3) nanoparticles of various sizes. Silica gels were obtained by rapid hydrolysis of tetraethoxysilane in an aqueous–alcoholic solution of iron(III) nitrate and then dried to form xerogels. The annealing of the xerogels at temperatures of 1000–1250 °C led to the formation of ε-Fe2O3 particles with average sizes of 7–38 nm, respectively. With an increase in the annealing temperature, the coercivity of the samples increased and reached 21 kOe for 1200 °C, while the frequency of the natural ferromagnetic resonance increased from 161 to 170 GHz followed by narrowing of the absorption lines from 40 to 2 GHz. It was shown for the first time that the parameters of the natural ferromagnetic resonance line of epsilon iron oxide can be varied by controlling the size of ε-Fe2O3 particles. It was also demonstrated that the duration of ε-Fe2O3 synthesis can be considerably reduced by increasing the rate of tetraethoxysilane hydrolysis, while the magnetic properties of the target material do not degrade. [ABSTRACT FROM AUTHOR]

Published
2021
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48. Rotational dynamics of colloidal hexaferrite nanoplates

Author

Eliseev, Artem A., primary, Eliseev, Andrei A., additional, Trusov, Lev A., additional, Chumakov, Andrei P., additional, Boesecke, Peter, additional, Anokhin, Evgeny O., additional, Vasiliev, Alexander V., additional, Sleptsova, Anastasia E., additional, Gorbachev, Evgeny A., additional, Korolev, Vladimir V., additional, and Kazin, Pavel E., additional

Published
2018
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49. Enhancing lithium-ion conductivity in NASICON glass-ceramics by adding yttria

Author

Vizgalov, Victor A., primary, Nestler, Tina, additional, Trusov, Lev A., additional, Bobrikov, Ivan A., additional, Ivankov, Oleksandr I., additional, Avdeev, Mikhail V., additional, Motylenko, Mykhaylo, additional, Brendler, Erica, additional, Vyalikh, Anastasia, additional, Meyer, Dirk C., additional, and Itkis, Daniil M., additional

Published
2018
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50. Ca–Al double-substituted strontium hexaferrites with giant coercivity

Author

Trusov, Lev A., primary, Gorbachev, Evgeny A., additional, Lebedev, Vasily A., additional, Sleptsova, Anastasia E., additional, Roslyakov, Ilya V., additional, Kozlyakova, Ekaterina S., additional, Vasiliev, Alexander V., additional, Dinnebier, Robert E., additional, Jansen, Martin, additional, and Kazin, Pavel E., additional

Published
2018
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