2025/09/09 by Sosuke Hori, Hori, Sosuke, Kohei Ueda +5
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Heusler alloys: electronic and magnetic properties #Magnetic properties of thin films #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Topological Materials and Phenomena
paper · pdf · doi:10.48550/arxiv.2509.07390
openalex publication_date 2025/09/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Spin Hall magnetoresistance (SMR) is an intriguing spin-dependent transport phenomenon in bilayers consisting of non-magnetic and magnetic layers. Here, we report on the influence of longitudinal spin current absorption by the magnetic layer on SMR in bilayers composed of Co20Fe60B20 (CoFeB) and epitaxial SrIrO3, where SrIrO3 is used as a highly-resistive spin current source. We observed a clear SMR signal and an enhancement in the SMR ratio with increasing CoFeB layer thickness, in qualitative agreement with an SMR model that incorporates the spin current absorption. The effective spin Hall angle is corrected from 0.07 to 0.12 with consideration of the spin current absorption, corresponding to a relative correction of ~71%. Our findings highlight the pronounced impact of the spin current absorption by the magnetic layer on the SMR mechanism when employing highly-resistive non-magnetic layer such as SrIrO3, as well as other emerging quantum materials.