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Correlation between crystal structure and magnetism in PLD grown epitaxial films of ε-Fe(2)O(3) on GaN

In the present paper we discuss correlations between crystal structure and magnetic properties of epitaxial ε-Fe(2)O(3) films grown on GaN. The large magnetocrystalline anisotropy and room temperature multiferroic properties of this exotic iron oxide polymorph, make it a perspective material for the...

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Autores principales: Suturin, Sergey M., Korovin, Alexander M., Sitnikova, Alla A., Kirilenko, Demid A., Volkov, Mikhail P., Dvortsova, Polina A., Ukleev, Victor A., Tabuchi, Masao, Sokolov, Nikolai S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Taylor & Francis 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8856044/
https://www.ncbi.nlm.nih.gov/pubmed/35185387
http://dx.doi.org/10.1080/14686996.2020.1870870
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author Suturin, Sergey M.
Korovin, Alexander M.
Sitnikova, Alla A.
Kirilenko, Demid A.
Volkov, Mikhail P.
Dvortsova, Polina A.
Ukleev, Victor A.
Tabuchi, Masao
Sokolov, Nikolai S.
author_facet Suturin, Sergey M.
Korovin, Alexander M.
Sitnikova, Alla A.
Kirilenko, Demid A.
Volkov, Mikhail P.
Dvortsova, Polina A.
Ukleev, Victor A.
Tabuchi, Masao
Sokolov, Nikolai S.
author_sort Suturin, Sergey M.
collection PubMed
description In the present paper we discuss correlations between crystal structure and magnetic properties of epitaxial ε-Fe(2)O(3) films grown on GaN. The large magnetocrystalline anisotropy and room temperature multiferroic properties of this exotic iron oxide polymorph, make it a perspective material for the development of low power consumption magnetic media storage devices. Extending our recent progress in PLD growth of ε-Fe(2)O(3) on the surface of technologically important nitride semiconductors, we apply reciprocal space tomography by electron and x-ray diffraction to investigate the break of crystallographic symmetry occurring at the oxide-nitride interface resulting in the appearance of anisotropic crystallographic disorder in the sub-100 nm ε-Fe(2)O(3) films. The orthorhombic-on-hexagonal nucleation scenario is shown responsible for the development of a peculiar columnar structure observed in ε-Fe(2)O(3) by means of HRTEM and AFM. The complementary information on the direct and reciprocal space structure of the columnar ε-Fe(2)O(3) films is obtained by various techniques and correlated to their magnetic properties. The peculiar temperature dependence of magnetization studied by the small-field magnetization derivative method and by neutron diffraction reveals the existence of a magnetic softening below 150 K, similar to the one observed earlier solely in nanoparticles. The magnetization reversal in ε-Fe(2)O(3) films probed by X-ray magnetic circular dichroism is found different from the behavior of the bulk averaged magnetization measured by conventional magnetometry. The presented results fill the gap between the numerous studies performed on randomly oriented ε-Fe(2)O(3) nanoparticles and much less frequent investigations of epitaxial epsilon ferrite films with lattice orientation fixed by the substrate.
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spelling pubmed-88560442022-02-19 Correlation between crystal structure and magnetism in PLD grown epitaxial films of ε-Fe(2)O(3) on GaN Suturin, Sergey M. Korovin, Alexander M. Sitnikova, Alla A. Kirilenko, Demid A. Volkov, Mikhail P. Dvortsova, Polina A. Ukleev, Victor A. Tabuchi, Masao Sokolov, Nikolai S. Sci Technol Adv Mater Optical, Magnetic and Electronic Device Materials In the present paper we discuss correlations between crystal structure and magnetic properties of epitaxial ε-Fe(2)O(3) films grown on GaN. The large magnetocrystalline anisotropy and room temperature multiferroic properties of this exotic iron oxide polymorph, make it a perspective material for the development of low power consumption magnetic media storage devices. Extending our recent progress in PLD growth of ε-Fe(2)O(3) on the surface of technologically important nitride semiconductors, we apply reciprocal space tomography by electron and x-ray diffraction to investigate the break of crystallographic symmetry occurring at the oxide-nitride interface resulting in the appearance of anisotropic crystallographic disorder in the sub-100 nm ε-Fe(2)O(3) films. The orthorhombic-on-hexagonal nucleation scenario is shown responsible for the development of a peculiar columnar structure observed in ε-Fe(2)O(3) by means of HRTEM and AFM. The complementary information on the direct and reciprocal space structure of the columnar ε-Fe(2)O(3) films is obtained by various techniques and correlated to their magnetic properties. The peculiar temperature dependence of magnetization studied by the small-field magnetization derivative method and by neutron diffraction reveals the existence of a magnetic softening below 150 K, similar to the one observed earlier solely in nanoparticles. The magnetization reversal in ε-Fe(2)O(3) films probed by X-ray magnetic circular dichroism is found different from the behavior of the bulk averaged magnetization measured by conventional magnetometry. The presented results fill the gap between the numerous studies performed on randomly oriented ε-Fe(2)O(3) nanoparticles and much less frequent investigations of epitaxial epsilon ferrite films with lattice orientation fixed by the substrate. Taylor & Francis 2021-02-04 /pmc/articles/PMC8856044/ /pubmed/35185387 http://dx.doi.org/10.1080/14686996.2020.1870870 Text en © 2021 The Author(s). Published by National Institute for Materials Science in partnership with Taylor & Francis Group. https://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Optical, Magnetic and Electronic Device Materials
Suturin, Sergey M.
Korovin, Alexander M.
Sitnikova, Alla A.
Kirilenko, Demid A.
Volkov, Mikhail P.
Dvortsova, Polina A.
Ukleev, Victor A.
Tabuchi, Masao
Sokolov, Nikolai S.
Correlation between crystal structure and magnetism in PLD grown epitaxial films of ε-Fe(2)O(3) on GaN
title Correlation between crystal structure and magnetism in PLD grown epitaxial films of ε-Fe(2)O(3) on GaN
title_full Correlation between crystal structure and magnetism in PLD grown epitaxial films of ε-Fe(2)O(3) on GaN
title_fullStr Correlation between crystal structure and magnetism in PLD grown epitaxial films of ε-Fe(2)O(3) on GaN
title_full_unstemmed Correlation between crystal structure and magnetism in PLD grown epitaxial films of ε-Fe(2)O(3) on GaN
title_short Correlation between crystal structure and magnetism in PLD grown epitaxial films of ε-Fe(2)O(3) on GaN
title_sort correlation between crystal structure and magnetism in pld grown epitaxial films of ε-fe(2)o(3) on gan
topic Optical, Magnetic and Electronic Device Materials
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8856044/
https://www.ncbi.nlm.nih.gov/pubmed/35185387
http://dx.doi.org/10.1080/14686996.2020.1870870
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