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Inverse Tunnel Magnetocapacitance in Fe/Al-oxide/Fe(3)O(4)
Magnetocapacitance (MC) effect, observed in a wide range of materials and devices, such as multiferroic materials and spintronic devices, has received considerable attention due to its interesting physical properties and practical applications. A normal MC effect exhibits a higher capacitance when s...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5454010/ https://www.ncbi.nlm.nih.gov/pubmed/28572572 http://dx.doi.org/10.1038/s41598-017-02361-4 |
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author | Kaiju, Hideo Nagahama, Taro Sasaki, Shun Shimada, Toshihiro Kitakami, Osamu Misawa, Takahiro Fujioka, Masaya Nishii, Junji Xiao, Gang |
author_facet | Kaiju, Hideo Nagahama, Taro Sasaki, Shun Shimada, Toshihiro Kitakami, Osamu Misawa, Takahiro Fujioka, Masaya Nishii, Junji Xiao, Gang |
author_sort | Kaiju, Hideo |
collection | PubMed |
description | Magnetocapacitance (MC) effect, observed in a wide range of materials and devices, such as multiferroic materials and spintronic devices, has received considerable attention due to its interesting physical properties and practical applications. A normal MC effect exhibits a higher capacitance when spins in the electrodes are parallel to each other and a lower capacitance when spins are antiparallel. Here we report an inverse tunnel magnetocapacitance (TMC) effect for the first time in Fe/AlO(x)/Fe(3)O(4) magnetic tunnel junctions (MTJs). The inverse TMC reaches up to 11.4% at room temperature and the robustness of spin polarization is revealed in the bias dependence of the inverse TMC. Excellent agreement between theory and experiment is achieved for the entire applied frequency range and the wide bipolar bias regions using Debye-Fröhlich model (combined with the Zhang formula and parabolic barrier approximation) and spin-dependent drift-diffusion model. Furthermore, our theoretical calculations predict that the inverse TMC effect could potentially reach 150% in MTJs with a positive and negative spin polarization of 65% and −42%, respectively. These theoretical and experimental findings provide a new insight into both static and dynamic spin-dependent transports. They will open up broader opportunities for device applications, such as magnetic logic circuits and multi-valued memory devices. |
format | Online Article Text |
id | pubmed-5454010 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-54540102017-06-06 Inverse Tunnel Magnetocapacitance in Fe/Al-oxide/Fe(3)O(4) Kaiju, Hideo Nagahama, Taro Sasaki, Shun Shimada, Toshihiro Kitakami, Osamu Misawa, Takahiro Fujioka, Masaya Nishii, Junji Xiao, Gang Sci Rep Article Magnetocapacitance (MC) effect, observed in a wide range of materials and devices, such as multiferroic materials and spintronic devices, has received considerable attention due to its interesting physical properties and practical applications. A normal MC effect exhibits a higher capacitance when spins in the electrodes are parallel to each other and a lower capacitance when spins are antiparallel. Here we report an inverse tunnel magnetocapacitance (TMC) effect for the first time in Fe/AlO(x)/Fe(3)O(4) magnetic tunnel junctions (MTJs). The inverse TMC reaches up to 11.4% at room temperature and the robustness of spin polarization is revealed in the bias dependence of the inverse TMC. Excellent agreement between theory and experiment is achieved for the entire applied frequency range and the wide bipolar bias regions using Debye-Fröhlich model (combined with the Zhang formula and parabolic barrier approximation) and spin-dependent drift-diffusion model. Furthermore, our theoretical calculations predict that the inverse TMC effect could potentially reach 150% in MTJs with a positive and negative spin polarization of 65% and −42%, respectively. These theoretical and experimental findings provide a new insight into both static and dynamic spin-dependent transports. They will open up broader opportunities for device applications, such as magnetic logic circuits and multi-valued memory devices. Nature Publishing Group UK 2017-06-01 /pmc/articles/PMC5454010/ /pubmed/28572572 http://dx.doi.org/10.1038/s41598-017-02361-4 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Kaiju, Hideo Nagahama, Taro Sasaki, Shun Shimada, Toshihiro Kitakami, Osamu Misawa, Takahiro Fujioka, Masaya Nishii, Junji Xiao, Gang Inverse Tunnel Magnetocapacitance in Fe/Al-oxide/Fe(3)O(4) |
title | Inverse Tunnel Magnetocapacitance in Fe/Al-oxide/Fe(3)O(4) |
title_full | Inverse Tunnel Magnetocapacitance in Fe/Al-oxide/Fe(3)O(4) |
title_fullStr | Inverse Tunnel Magnetocapacitance in Fe/Al-oxide/Fe(3)O(4) |
title_full_unstemmed | Inverse Tunnel Magnetocapacitance in Fe/Al-oxide/Fe(3)O(4) |
title_short | Inverse Tunnel Magnetocapacitance in Fe/Al-oxide/Fe(3)O(4) |
title_sort | inverse tunnel magnetocapacitance in fe/al-oxide/fe(3)o(4) |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5454010/ https://www.ncbi.nlm.nih.gov/pubmed/28572572 http://dx.doi.org/10.1038/s41598-017-02361-4 |
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