Bulk Rashba-Type Spin Splitting in Non-Centrosymmetric Artificial Superlattices

Authors
Ham, Woo SeungHo, Thi HuynhShiota, YoichiIino, TatsuyaAndo, FuyukiIkebuchi, TetsuyaKotani, YoshinoriNakamura, TetsuyaKan, DaisukeShimakawa, YuichiMoriyma, TakahiroIm, EunjiLee, Nyun-JongKim, Kyoung-WhanHong, Soon CheolRhim, Sonny H. H.Ono, TeruoKim, Sanghoon
Issue Date
2023-04
Publisher
Wiley-VCH Verlag
Citation
Advanced Science, v.10, no.12
Abstract
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.
Keywords
ORBIT-TORQUE; CURRENT-DRIVEN; artificial superlattice; bulk Rashba-type spin splitting; charge-to-spin conversion; spin current
ISSN
2198-3844
URI
https://pubs.kist.re.kr/handle/201004/113881
DOI
10.1002/advs.202206800
Appears in Collections:
KIST Article > 2023
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