Crystal symmetry plays an important role in the Hall effects. Unconventional spin Hall effect (USHE), characterized by Dresselhaus and out-of-plane spins, has been observed in materials with low crystal symmetry. Recently, antisymmetric planar Hall effect (APHE) was discovered in rutile RuO2 and IrO2 (101) thin films, which also exhibit low crystal symmetry. In this study, we report the observation of both USHE and APHE in IrO2 (111) films, using spin-torque ferromagnetic resonance (ST-FMR) and harmonic Hall measurements, respectively. Notably, the unconventional spin torque efficiency from Dresselhaus spin was more than double that of a previous report. Additionally, the temperature dependence of APHE suggests that it arises from the Lorentz force, constrained by crystal symmetry. Symmetry analysis supports the coexistence of USHE and APHE and demonstrates that both originate from the crystal symmetry of IrO2 (111), paving the way for a deeper understanding of Hall effects and related physical phenomena.
@article{arxiv.2411.05688,
title = {Coexistence of unconventional spin Hall effect and antisymmetric planar Hall effect in IrO$_2$},
author = {Yifei Yang and Sreejith Nair and Yihong Fan and Yu-Chia Chen and Qi Jia and Onri Jay Benally and Seungjun Lee and Seung Gyo Jeong and Zhifei Yang and Tony Low and Bharat Jalan and Jian-Ping Wang},
journal= {arXiv preprint arXiv:2411.05688},
year = {2025}
}
Comments
This work has been published by Applied Physics Letters on https://doi.org/10.1063/5.0240538