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タイトル: | Bulk Rashba‐Type Spin Splitting in Non‐Centrosymmetric Artificial Superlattices |
著者: | Ham, Woo Seung Ho, Thi Huynh Shiota, Yoichi https://orcid.org/0000-0003-1199-8438 (unconfirmed) Iino, Tatsuya Ando, Fuyuki Ikebuchi, Tetsuya Kotani, Yoshinori Nakamura, Tetsuya Kan, Daisuke https://orcid.org/0000-0002-7505-0059 (unconfirmed) Shimakawa, Yuichi https://orcid.org/0000-0003-1019-2512 (unconfirmed) Moriyama, Takahiro Im, Eunji Lee, Nyun‐Jong Kim, Kyoung‐Whan Hong, Soon Cheol Rhim, Sonny H. Ono, Teruo Kim, Sanghoon |
著者名の別形: | 咸, 佑承 塩田, 陽一 飯野, 達也 安藤, 冬希 池渕, 徹也 菅, 大介 島川, 祐一 森山, 貴広 小野, 輝男 |
キーワード: | artificial superlattice bulk Rashba-type spin splitting charge-to-spin conversion spin current |
発行日: | 26-Apr-2023 |
出版者: | Wiley |
誌名: | Advanced Science |
巻: | 10 |
号: | 12 |
論文番号: | 2206800 |
抄録: | Spin current, converted from charge current via spin Hall or Rashba effects, can transfer its angular momentum to local moments in a ferromagnetic layer. In this regard, the high charge-to-spin conversion efficiency is required for magnetization manipulation for developing future memory or logic devices including magnetic random-access memory. Here, the bulk Rashba-type charge-to-spin conversion is demonstrated in an artificial superlattice without centrosymmetry. The charge-to-spin conversion in [Pt/Co/W] superlattice with sub-nm scale thickness shows strong W thickness dependence. When the W thickness becomes 0.6 nm, the observed field-like torque efficiency is about 0.6, which is an order larger than other metallic heterostructures. First-principles calculation suggests that such large field-like torque arises from bulk-type Rashba effect due to the vertically broken inversion symmetry inherent from W layers. The result implies that the spin splitting in a band of such an ABC-type artificial SL can be an additional degree of freedom for the large charge-to-spin conversion. |
著作権等: | © 2023 The Authors. Advanced Science published by Wiley-VCH GmbH This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
URI: | http://hdl.handle.net/2433/286742 |
DOI(出版社版): | 10.1002/advs.202206800 |
PubMed ID: | 36808490 |
出現コレクション: | 学術雑誌掲載論文等 |
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