| Presentation | 2022-12-08 Enhancement of magnetic relaxation constant by phase control of CoFeB/Sb2Te3 Misako Morota, Yuta Saito, Shogo Hatayama, Noriyuki Uchida, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Chalcogenide materials such as Sb_2Te_3 and Bi_2Te_3 are known as phase-change materials, which can reversely change their phases between crystalline and amorphous by electrical stimuli, and the resultant resistivity contrast is used for nonvolatile memory (phase-change memory: PCM). In addition, these materials are a representative topological insulator, where the presence of intrinsic strong spin-orbit coupling is expected to provide highly efficient charge to spin current conversion. In this study, we focused on the relationship between the crystalline structure (atomic alignment) and the spin characteristics. The bilayer samples consisting of ferromagnetic CoFeB and topological insulator Sb_2Te_3 were fabricated with different phases of Sb_2Te_3, and the magnetic relaxation constants were investigated by ferromagnetic resonance (FMR) measurements. Enhancement of the magnetic relaxation constant was observed for crystalline Sb_2Te_3 with thinning the layer thickness, while the amorphous sample showed the independent behavior on film thickness. These results support that the phase-changeable spintronic devices can be realized. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | chalcogenide / phase-change material / topological insulator / ferromagnetic resonance / spin-pumping |
| Paper # | MRIS2022-23 |
| Date of Issue | 2022-12-01 (MRIS) |
| Conference Information | |
| Committee | MRIS / ITE-MMS |
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| Conference Date | 2022/12/8(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Ehime Univ. + Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Signal Processing and Others |
| Chair | Ikuya Tagawa(Tohoku Inst. of Tech.) |
| Vice Chair | |
| Secretary | (Ehime Univ.) / (Samsung) |
| Assistant | Nobuaki Kikuchi(Tohoku Univ.) / Toshiki Yamaji(AIST) |
| Paper Information | |
| Registration To | Technical Committee on Magnetic Recording & Information Storage / Technical Group on Multi-media Storage |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Enhancement of magnetic relaxation constant by phase control of CoFeB/Sb2Te3 |
| Sub Title (in English) | |
| Keyword(1) | chalcogenide |
| Keyword(2) | phase-change material |
| Keyword(3) | topological insulator |
| Keyword(4) | ferromagnetic resonance |
| Keyword(5) | spin-pumping |
| 1st Author's Name | Misako Morota |
| 1st Author's Affiliation | NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY(AIST) |
| 2nd Author's Name | Yuta Saito |
| 2nd Author's Affiliation | NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY(AIST) |
| 3rd Author's Name | Shogo Hatayama |
| 3rd Author's Affiliation | NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY(AIST) |
| 4th Author's Name | Noriyuki Uchida |
| 4th Author's Affiliation | NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY(AIST) |
| Date | 2022-12-08 |
| Paper # | MRIS2022-23 |
| Volume (vol) | vol.122 |
| Number (no) | MRIS-297 |
| Page | pp.pp.28-31(MRIS), |
| #Pages | 4 |
| Date of Issue | 2022-12-01 (MRIS) |