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arXiv · 2606.23714

Field-like Perturbation Enabled Six-state Readout in Triaxial $\alpha$-$\mathrm{Fe}_{2}\mathrm{O}_{3}$|Pt Bi-layers

Aditya A. Wagh·Shwetha G. Bhat·Krishna Jha·Aiswarya Sukumaran·P. S. Anil Kumar
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Abstract

Canted antiferromagnet $\alpha$-$\mathrm{Fe}_{2}\mathrm{O}_{3}$|Pt bilayers offer a platform for multistate memory, but spin Hall magnetoresistance (SMR) readout cannot distinguish states separated by $180^{\circ}$, limiting detection to three states. We show that a field-like perturbation lifts the degeneracy of opposite states in $\alpha$-$\mathrm{Fe}_{2}\mathrm{O}_{3}$, enabling the resolution of six states in the SMR signal. We introduce a dual-modulation SMR method to mitigate thermal drifts and enable reliable readout. Computations of first- and second-harmonic SMR reveal the role of exchange, anisotropy and field-like perturbations in resolving the states.

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Aditya A. Wagh, Shwetha G. Bhat, Krishna Jha, Aiswarya Sukumaran, P. S. Anil Kumar. 2026-06-16. Field-like Perturbation Enabled Six-state Readout in Triaxial $\alpha$-$\mathrm{Fe}_{2}\mathrm{O}_{3}$|Pt Bi-layers. https://arxiv.org/abs/2606.23714

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