[16p-Z19-1~23] 10.1 Emerging materials in spintronics and magnetics (including fabrication and characterization methodologies)

[16p-Z19-23] Evaluation of Spin Hall effect in YPt alloy

〇Kou Fujiwara¹, Takanori Shirokura¹, Pham Nam Hai^1,2 (1.Tokyo Tech, 2.Univ. Tokyo)

Keywords:spin Hall effect, Pt-based alloy, YPt

We investigated the physical origin of spin Hall effect (SHE) in YPt, a Pt-based alloy with orthorhombic crystal structure.We observed a strong sensitivity of the spin Hall angle θ_SH to its resistivity, and revealed that the sensitivity was origenated from both the intrinsic mechanism and the extrinsic side-jump mechanism with opposite polarity. We also evaluated spin relaxation length λ_s from the thickness dependence of YPt, and that was ~3 times longer than that expected by assuming the Elliot-Yafet mechanism. Our result shows that spin Hall physics in YPt is different from that of conventional Pt-based alloys having the face-centered-cubic structure.