Quantitative separation of planar Nernst effects in harmonic Hall measurements of spin-orbit torques in Pt/Co/HfO/Ta multilayers.

ABSTRACT: Spin-orbit torques (SOTs) provide a promising pathway for efficient magnetization switching in magnetic random-access memory (MRAM) devices, but their quantitative evaluation is complicated by thermal artifacts. While increasing the resistivity of heavy metals can enhance the spin Hall angle through scattering mechanisms, high-resistivity systems also exhibit sizable thermoelectric signals that obscure reliable SOT extraction. In this study, we investigate SOTs in Pt/Co/HfO/Ta multilayers with in-plane magnetic anisotropy, comparing samples with low and high-resistivity Pt layers prepared under different sputtering pressures. The high-resistivity device exhibits both enhanced damping-like torque and an additional unconventional second harmonic signal. By applying symmetry-based analysis to

SUBMITTER: Yun C 

PROVIDER: S-EPMC12808109 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature