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Spin-Orbit-Induced Ising Ferromagnetism at a van der Waals Interface
Hideki Matsuoka1, Stewart Edward Barnes2, Jun'ichi Ieda3
1Quantum-Phase Electronics Center and Department of Applied Physics, the University of Tokyo, Tokyo 113-8656, Japan.
Nano Letters
|February 4, 2021
Summary
Researchers discovered strong magnetic anisotropy without orbital angular momentum at the interface of van der Waals materials. This finding enhances magnetic properties in 2D materials, revealing a new proximity effect.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Surface Science
Background:
- Magnetocrystalline anisotropy is crucial for magnetic order in 2D materials, typically requiring spin-orbit interaction (SOI) with orbital angular momentum.
- Van der Waals (vdW) materials offer unique platforms for exploring novel physical phenomena at interfaces.
Purpose of the Study:
- To investigate the emergence of magnetic anisotropy at the interface of NbSe2 and V5Se8, specifically without orbital angular momentum.
- To understand the mechanism behind induced magnetic anisotropy in vdW heterostructures.
Main Methods:
- Fabrication of heterostructures using archetypal metallic vdW material NbSe2 and isotropic vdW ferromagnet V5Se8.
- Experimental characterization of magnetic properties and anisotropy at the vdW interface.
- Theoretical modeling to explain the observed magnetic proximity effect.
Main Results:
- Observed strong out-of-plane magnetic anisotropy in V5Se8 at the vdW interface with NbSe2, despite the absence of orbital angular momentum.
- Demonstrated that Zeeman SOI in NbSe2 induces robust magnetic anisotropy in V5Se8 down to the 2D limit.
- Reported a more than 2-fold enhancement of the transition temperature in V5Se8 due to the proximity effect.
Conclusions:
- A conceptually new magnetic proximity effect at vdW interfaces has been demonstrated.
- This effect enables the engineering of magnetic properties in 2D materials without relying on orbital angular momentum.
- The findings expand the possibilities for emergent phenomena in vdW heterostructures.
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