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arXiv · 2401.04582

Topological transverse spin transport in a canted antiferromagnet/heavy metal heterostructure

Wesley Roberts·Bowen Ma·Martin Rodriguez-Vega·Gregory A. Fiete
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Abstract

We theoretically study the conditions under which a spin Nernst effect - a transverse spin current induced by an applied temperature gradient - can occur in a canted antiferromagnetic insulator, such as ${\rm LaFeO_3}$ and other materials of the same family. The spin Nernst effect may provide a microscopic mechanism for an experimentally observed anomalous thermovoltage in ${\rm LaFeO_3}$/Pt heterostructures, where spin is transferred across the insulator/metal interface when a temperature gradient is applied to ${\rm LaFeO_3}$ parallel to the interface [W. Lin ${\it et \; al}$, Nat. Phys. ${\bf 18}$, 800 (2022)]. We find that ${\rm LaFeO_3}$ exhibits a topological spin Nernst effect when inversion symmetry is broken on the axes parallel to both the applied temperature gradient and the direction of spin transport, which can result in a spin injection across the insulator/metal interface. Our work provides a general derivation of a symmetry-breaking-induced spin Nernst effect, which may open a path to engineering a finite spin Nernst effect in systems where it would otherwise not arise.

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Wesley Roberts, Bowen Ma, Martin Rodriguez-Vega, Gregory A. Fiete. 2024-01-09. Topological transverse spin transport in a canted antiferromagnet/heavy metal heterostructure. https://doi.org/10.1103/physrevb.109.174436

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