Resolving Spin Orientation in the van der Waals Antiferromagnet CrCl<sub>3</sub> via the Exciton-Enhanced Magneto-Optical Voigt Effect.
basic_science · Level V
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- Record sourced from PubMed, PMID 40614105.
- Also identified by DOI 10.1021/acsnano.5c06978.
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Abstract
Two-dimensional (2D) van der Waals (vdW) antiferromagnets are promising platforms for exploring quantum magnetism and spintronic devices. However, detecting antiferromagnetic order in ultrathin vdW layers presents a significant technological challenge. This study demonstrates the resolution of in-plane antiferromagnetic order and spin orientation in the atomically thin vdW antiferromagnet CrCl<sub>3</sub> using the resonant magneto-optical Voigt effect. Notably, a pronounced quadratic magnetic linear dichroism is observed at resonant excitonic transitions of around 1.81 eV. Furthermore, we elucidate the antiferromagnetic domains and spin-flop transitions in this system by analyzing both the amplitude and orientation of the magnetic linear dichroism. Our approach leveraging resonant magneto-optical measurements provides an accessible and noninvasive means to probe antiferromagnetic orders and spin dynamics in quasi-2D magnetic systems.