Work

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

Year: 2026

Type: preprint

Abstract: Canted antiferromagnet $α$-$\mathrm{Fe}_{2}\mathrm{O}_{3}$|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 $α$-$\mathrm{Fe}_{2}\mathrm{O}_{3}$, 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.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2606.23714

Authors: Wagh, Aditya A., Bhat, Shwetha G., Jha, Krishna, Sukumaran, Aiswarya, Kumar, P. S. Anil

Institutions: Indian Institute of Science Bangalore, Indian Institute of Science Education and Research, Tirupati

Language: English

Topic: Magnetic properties of thin films

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Indian Institute of Science, Department of Science and Technology, Ministry of Science and Technology, India, National NanoFab Center

OpenAlex ID: W7165748338

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