Quantitative analysis of magnon characteristics with unidirectional magnetoresistance
- Authors
- Lee, Nyun Jong; Jang, Heechan; Park, Eunkang; Lee, Ki-Seung; Jeong, Seyeop; Lee, Soogil; Park, Byong-Guk; You, Chun-Yeol; Kim, Kyoung-Whan; Kim, Sanghoon
- Issue Date
- Dec-2023
- Publisher
- American Physical Society (APS)
- Citation
- Physical Review Applied, v.20, no.6
- Journal Title
- Physical Review Applied
- Volume
- 20
- Number
- 6
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/90419
- DOI
- 10.1103/physrevapplied.20.064006
- ISSN
- 2331-7019
- Abstract
- Unidirectional magnetoresistance (UMR) is a magnetoresistance family that arises from spin-current generation in ferromagnet (FM)/nonmagnetic heavy metal (HM) bilayers. Because UMR exhibits asymmetric behavior owing to the current or external magnetic field directions, it is easy to quantify the amount of charge-to-spin conversion in a system and the sign of the spin current. UMR has been explained by two major mechanisms: spin accumulation at the FM/HM interface and electron-magnon scattering in an FM layer. In this study, we investigated the thickness and temperature dependence of the UMR of Ta/Co and Pt/Co bilayer structures and numerically analyzed the contribution of the electron-magnon scattering using a self-developed quantitative-analysis model. The magnon UMR was dominant in the Pt/Co samples, and the spin-accumulation-UMR and magnon-UMR trends were separated in the Ta/Co samples by thickness. The magnitude of the UMR strongly depends on the choice of the HM. Our findings provide a method to quantitatively separate the contributions of each mechanism.
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