Unidirectional spin Hall magnetoresistance in epitaxial Cr/Fe bilayer from electron-magnon scattering
SCIE
SCOPUS
- Title
- Unidirectional spin Hall magnetoresistance in epitaxial Cr/Fe bilayer from electron-magnon scattering
- Authors
- Nguyen, Thanh Huong Thi; Nguyen, Van Quang; Jeong, Seyeop; Park, Eunkang; Jang, Heechan; Lee, Nyun Jong; Lee, Soogil; Park, Byong-Guk; Cho, Sunglae; Lee, Hyun-Woo; Hong, Jung-Il; Kim, Sanghoon
- Date Issued
- 2021-11
- Publisher
- NATURE PUBLISHING GROUP
- 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/109146
- DOI
- 10.1038/s42005-021-00743-9
- ISSN
- 2399-3650
- Article Type
- Article
- Citation
- Communications Physics, vol. 4, no. 1, 2021-11
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