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

Thanh Huong Thi Nguyen, Van Quang Nguyen, Seyeop Jeong, Eunkang Park, Heechan Jang, Nyun Jong Lee, Soogil Lee, Byong Guk Park, Sunglae Cho, Hyun Woo Lee, Jung Il Hong, Sanghoon Kim

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10 Scopus citations

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.

Original languageEnglish
Article number247
JournalCommunications Physics
Volume4
Issue number1
DOIs
StatePublished - Dec 2021

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© 2021, The Author(s).

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