First-principles study of the anisotropic magneto-Peltier effect

TL;DR

This paper presents a theoretical first-principles analysis of the anisotropic magneto-Peltier effect, revealing the dominant role of spin-orbit interactions and predicting materials with enhanced effects.

Contribution

It introduces a first-principles-based Boltzmann transport method including spin-orbit coupling to analyze and predict anisotropic magneto-Peltier effects in ferromagnetic metals.

Findings

Ni exhibits larger anisotropy of the Peltier coefficient than Fe.

Spin-flip electron transitions due to spin-orbit interaction are key to the effect.

Predicted several ferromagnetic metals with larger anisotropic Peltier effects.

Abstract

We study theoretically the anisotropic magneto-Peltier effect, which was recently demonstrated experimentally. A first-principles-based Boltzmann transport approach including the spin-orbit interaction shows that Ni has a larger anisotropy of the Peltier coefficient ($\Delta \Pi$) than Fe, consistent with experiments. It is clarified that spin-flip electron transitions due to the spin-orbit interaction are the key in the mechanism of the large anisotropic magneto-Peltier effect. Using our method, we further predict several ferromagnetic metals with much larger $\Delta \Pi$ than that of Ni.