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 2024-01-12T06:30:59Z 2024-01-12T06:30:59Z 2024-01-03 2023-12 https://pubs.kist.re.kr/handle/201004/79683 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. English American Physical Society Quantitative analysis of magnon characteristics with unidirectional magnetoresistance Article 10.1103/physrevapplied.20.064006 1 Physical Review Applied, v.20, no.6 Physical Review Applied 20 6 N scie scopus 001156170900001 Physics, Applied Physics Article