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Unidirectional spin Hall magnetoresistance in epitaxial Cr/Fe bilayer from electron-magnon scattering

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Abstract
Unidirectional Spin Hall magnetoresistance (USMR) is a non-linear phenomenon recently observed in ferromagnet (FM)/nonmagnetic metal (NM) bilayer structures. Two very different mechanisms of USMR have been proposed; one relies on the current-direction-dependence of electron-magnon scattering in a FM layer, and the other on the current-direction-dependence of the spin accumulation at the FM/NM interface. In this study, we investigate the USMR in epitaxial Cr/Fe bilayers finding that the USMR is significantly enhanced when the Fe magnetization is aligned to a particular crystallographic direction where the magnon magnetoresistance (MMR) by the electron-magnon scattering becomes stronger. This highlights the importance of the electron-magnon scattering for the understanding of USMR in Cr/Fe bilayers. Our result also suggests a route to enhance the efficiency of magnon generation in the magnonic devices. Lastly, we discuss the Ising-type spin exchange as a possible origin of the crystallographic direction dependences of the USMR and the MMR.

Unidirectional spin Hall magnetoresistance (USMR) is a directionally dependent feature of a ferromagnetic/normal metal bilayer for which the underlying mechanisms are still under debate. Here, the authors investigate the crystallographic dependence of USMR in epitaxial Cr/Fe bilayers finding that electron-magnon scattering plays an important role.
Author(s)
Thanh Huong Thi NguyenVan Quang Nguyen정세엽박은강장희찬이년종이수길박병국조성래이현우홍정일김상훈
Issued Date
2021
Type
Article
Keyword
high energy magnon
DOI
10.1038/s42005-021-00743-9
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9550
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_doaj_primary_oai_doaj_org_article_0742931fb183457091042036482a6d6c&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Unidirectional%20spin%20Hall%20magnetoresistance%20in%20epitaxial%20Cr%2FFe%20bilayer%20from%20electron-magnon%20scattering&offset=0&pcAvailability=true
Publisher
communications physics
Location
독일
Language
영어
ISSN
2399-3650
Citation Volume
4
Citation Number
1
Citation Start Page
247
Citation End Page
247
Appears in Collections:
Natural Science > Physics
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