Enhancement of permittivity off-diagonal terms in rare earth transition metal / heavy metal hetero-structured films
The spin Hall effect, Dzyaloshinskii-Moriya interaction, Rashba effect, etc. are extremely important effects for the development of the conduction phenomenon of spin electronics due to the breaking of the spatial inversion symmetry of the hetero interface made of heavy metals such as Pt and W. These...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-08-01
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| Series: | Frontiers in Physics |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fphy.2022.949571/full |
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| author | Kei Matsumoto Pham Van Thach Pham Van Thach Satoshi Sumi Sina Ranjbar Kenji Tanabe Hiroyuki Awano Shihao Wang Takayuki Ishibashi Shin Saito |
| author_facet | Kei Matsumoto Pham Van Thach Pham Van Thach Satoshi Sumi Sina Ranjbar Kenji Tanabe Hiroyuki Awano Shihao Wang Takayuki Ishibashi Shin Saito |
| author_sort | Kei Matsumoto |
| collection | DOAJ |
| description | The spin Hall effect, Dzyaloshinskii-Moriya interaction, Rashba effect, etc. are extremely important effects for the development of the conduction phenomenon of spin electronics due to the breaking of the spatial inversion symmetry of the hetero interface made of heavy metals such as Pt and W. These are due to SOI (spin-orbit interaction). Most of these studies have been conducted in the frequency domain below GHz, and there are few studies in the energy domain of light. Therefore, in the region of light energy, the magnetic optical Kerr effect spectra of the TbCo/Pt hetero-structured film with large SOI from the Pt interface and the TbCo/Cu hetero-structured film with small SOI from the Cu interface were measured, and the permittivity tensors were investigated respectively. As a result, in the TbCo/Pt hetero-structured film, the dielectric constant off-diagonal component real part of the thin TbCo layer increased about twice as much as that of bulk TbCo in the energy region smaller than 2.5 eV. However, this increase was not observed in the TbCo/Cu hetero-structured film. This result suggests that the influence of the Pt hetero interface where the spatial inversion symmetry is broken may appear even in the energy region of light. Furthermore, it has been confirmed that TbCo/W hetero-structured film using W with a large SOI has the same increasing effect as that of the TbCo/Pt. |
| first_indexed | 2024-12-11T00:49:50Z |
| format | Article |
| id | doaj.art-1bc28ff9728a449bb9c3fcbd813534fd |
| institution | Directory Open Access Journal |
| issn | 2296-424X |
| language | English |
| last_indexed | 2024-12-11T00:49:50Z |
| publishDate | 2022-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Physics |
| spelling | doaj.art-1bc28ff9728a449bb9c3fcbd813534fd2022-12-22T01:26:39ZengFrontiers Media S.A.Frontiers in Physics2296-424X2022-08-011010.3389/fphy.2022.949571949571Enhancement of permittivity off-diagonal terms in rare earth transition metal / heavy metal hetero-structured filmsKei Matsumoto0Pham Van Thach1Pham Van Thach2Satoshi Sumi3Sina Ranjbar4Kenji Tanabe5Hiroyuki Awano6Shihao Wang7Takayuki Ishibashi8Shin Saito9Department of Advanced Science and Technology, Toyota Technological Institute, Nagoya, JapanDepartment of Advanced Science and Technology, Toyota Technological Institute, Nagoya, JapanInstitute of Materials Science, Vietnam Academy of Science and Technology, Hanoi, VietnamDepartment of Advanced Science and Technology, Toyota Technological Institute, Nagoya, JapanDepartment of Advanced Science and Technology, Toyota Technological Institute, Nagoya, JapanDepartment of Advanced Science and Technology, Toyota Technological Institute, Nagoya, JapanDepartment of Advanced Science and Technology, Toyota Technological Institute, Nagoya, JapanDepartment of Materials Science and Technology, Nagaoka University of Technology, Nagaoka, JapanDepartment of Materials Science and Technology, Nagaoka University of Technology, Nagaoka, JapanDepartment of Electronic Engineering, Graduate School of Engineering, Tohoku University, Sendai, JapanThe spin Hall effect, Dzyaloshinskii-Moriya interaction, Rashba effect, etc. are extremely important effects for the development of the conduction phenomenon of spin electronics due to the breaking of the spatial inversion symmetry of the hetero interface made of heavy metals such as Pt and W. These are due to SOI (spin-orbit interaction). Most of these studies have been conducted in the frequency domain below GHz, and there are few studies in the energy domain of light. Therefore, in the region of light energy, the magnetic optical Kerr effect spectra of the TbCo/Pt hetero-structured film with large SOI from the Pt interface and the TbCo/Cu hetero-structured film with small SOI from the Cu interface were measured, and the permittivity tensors were investigated respectively. As a result, in the TbCo/Pt hetero-structured film, the dielectric constant off-diagonal component real part of the thin TbCo layer increased about twice as much as that of bulk TbCo in the energy region smaller than 2.5 eV. However, this increase was not observed in the TbCo/Cu hetero-structured film. This result suggests that the influence of the Pt hetero interface where the spatial inversion symmetry is broken may appear even in the energy region of light. Furthermore, it has been confirmed that TbCo/W hetero-structured film using W with a large SOI has the same increasing effect as that of the TbCo/Pt.https://www.frontiersin.org/articles/10.3389/fphy.2022.949571/fullhetero-structureferrimagnetspin-orbit interactionmagneto-opticsoff-diagonal permittivity |
| spellingShingle | Kei Matsumoto Pham Van Thach Pham Van Thach Satoshi Sumi Sina Ranjbar Kenji Tanabe Hiroyuki Awano Shihao Wang Takayuki Ishibashi Shin Saito Enhancement of permittivity off-diagonal terms in rare earth transition metal / heavy metal hetero-structured films Frontiers in Physics hetero-structure ferrimagnet spin-orbit interaction magneto-optics off-diagonal permittivity |
| title | Enhancement of permittivity off-diagonal terms in rare earth transition metal / heavy metal hetero-structured films |
| title_full | Enhancement of permittivity off-diagonal terms in rare earth transition metal / heavy metal hetero-structured films |
| title_fullStr | Enhancement of permittivity off-diagonal terms in rare earth transition metal / heavy metal hetero-structured films |
| title_full_unstemmed | Enhancement of permittivity off-diagonal terms in rare earth transition metal / heavy metal hetero-structured films |
| title_short | Enhancement of permittivity off-diagonal terms in rare earth transition metal / heavy metal hetero-structured films |
| title_sort | enhancement of permittivity off diagonal terms in rare earth transition metal heavy metal hetero structured films |
| topic | hetero-structure ferrimagnet spin-orbit interaction magneto-optics off-diagonal permittivity |
| url | https://www.frontiersin.org/articles/10.3389/fphy.2022.949571/full |
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