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arXiv · 2404.04000

Current-density-modulated Antiferromagnetic Domain Switching Revealed by Optical Imaging in Pt/CoO(001) Bilayer

Tong Wu·Haoran Chen·Tianping Ma·Jia Xu·Yizheng Wu
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Abstract

Efficient control of antiferromagnetic (AFM) domain switching in thin films is vital for advancing antiferromagnet-based memory devices. In this study, we directly observed the current-driven switching process of CoO AFM domains in the Pt/CoO(001) bilayer by the magneto-optical birefringence effect. The observed critical current density for AFM domain switching remains nearly constant across varying CoO thicknesses, associated with the consistent switching polarity n $\perp$ j, suggesting the dominance of the thermomagnetoelastic effect, where and stand for Neel vector and current density vector, respectively. Further confirmation comes from a similar switching process with n $\perp$ j observed in the Pt/Al2O3/CoO sample, excluding the contribution of spin current injection. Remarkably, it was also surprisingly observed that the Neel vector can be further switched parallel to the current direction (n//j) at higher current density. Our findings not only enhance the understanding of current-driven AFM domain switching but also present new avenues for manipulating AFM domains.

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Tong Wu, Haoran Chen, Tianping Ma, Jia Xu, Yizheng Wu. 2024-04-05. Current-density-modulated Antiferromagnetic Domain Switching Revealed by Optical Imaging in Pt/CoO(001) Bilayer. https://arxiv.org/abs/2404.04000

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