Ham, Woo Seung Ho, Thi Huynh Shiota, Yoichi Iino, Tatsuya Ando, Fuyuki Ikebuchi, Tetsuya Kotani, Yoshinori Nakamura, Tetsuya Kan, Daisuke Shimakawa, Yuichi Moriyma, Takahiro Im, Eunji Lee, Nyun-Jong Kim, Kyoung-Whan Hong, Soon Cheol Rhim, Sonny H. H. Ono, Teruo Kim, Sanghoon 2024-01-19T10:00:25Z 2024-01-19T10:00:25Z 2023-03-16 2023-04 2198-3844 https://pubs.kist.re.kr/handle/201004/113881 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 (M. 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. English Wiley-VCH Verlag Bulk Rashba-Type Spin Splitting in Non-Centrosymmetric Artificial Superlattices Article 10.1002/advs.202206800 1 Advanced Science, v.10, no.12 Advanced Science 10 12 Y scie scopus 000934858500001 2-s2.0-85148478230 Chemistry, Multidisciplinary Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article; Early Access ORBIT-TORQUE CURRENT-DRIVEN artificial superlattice bulk Rashba-type spin splitting charge-to-spin conversion spin current