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arXiv · 2505.24031

Electrical Detection of Single-Domain N\'eel Vector Reorientation across the Spin-Flop Transition in Cr2O3 Crystals

Wei-Cheng Liao·Haoyu Liu·Weilun Tan·Josiah Keagy·Jia-mou Chen·Jing Shi
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Abstract

Electrical transport measurements in heterostructures of antiferromagnetic Cr2O3 bulk crystals and a thin Pt layer exhibit sharp responses as the N\'eel vector of the Cr2O3 undergoes the spin-flop transition. This abrupt change can arise from several distinct mechanisms including magnetostriction, proximity-induced anomalous Hall, spin Hall anomalous Hall, and spin Hall planar Hall effects. While large Pt devices sensing multiple up/down domains can produce indistinguishable Hall signal jumps due to different initial N\'eel vector orientations, smaller Pt devices that sense single domains isolate the proximity-induced Hall signals. This allows direct electrical detection of N\'eel vector reorientation across the spin-flop transition in single domain regions. Furthermore, the single-domain state can be prepared by magnetic field cooling or magnetoelectric cooling. We demonstrate a method to control and characterize almost the three-dimensional orientation of single-domain N\'eel vectors by exploiting Hall measurements and cooling techniques, crucial for future antiferromagnetic spintronic applications.

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Wei-Cheng Liao, Haoyu Liu, Weilun Tan, Josiah Keagy, Jia-mou Chen, Jing Shi. 2025-05-29. Electrical Detection of Single-Domain N\'eel Vector Reorientation across the Spin-Flop Transition in Cr2O3 Crystals. https://arxiv.org/abs/2505.24031

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