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Anisotropic nonrelativistic charge-to-spin conversion in altermagnets

Mingbo Dou, Xianjie Wang, L. L. Tao

Abstract

The charge-to-spin conversion provides an efficient way to manipulate the magnetization by electrical means. In this work, we report on a study on the anisotropic nonrelativistic charge-to-spin conversion response to the current direction in altermagnets. Based on the general group-theoretical analysis, we derive analytical formulas for the anisotropic conversion ratio and identify its maximum value. We then exemplify those phenomena in representative altermagnets based on the density functional theory calculations. The highly anisotropic charge-to-spin conversion efficiency, varying from zero to several tens of percent, was demonstrated. Our work shines more light on the exploration of the nonrelativistic generation of spin currents in altermagnets.

Anisotropic nonrelativistic charge-to-spin conversion in altermagnets

Abstract

The charge-to-spin conversion provides an efficient way to manipulate the magnetization by electrical means. In this work, we report on a study on the anisotropic nonrelativistic charge-to-spin conversion response to the current direction in altermagnets. Based on the general group-theoretical analysis, we derive analytical formulas for the anisotropic conversion ratio and identify its maximum value. We then exemplify those phenomena in representative altermagnets based on the density functional theory calculations. The highly anisotropic charge-to-spin conversion efficiency, varying from zero to several tens of percent, was demonstrated. Our work shines more light on the exploration of the nonrelativistic generation of spin currents in altermagnets.

Paper Structure

This paper contains 5 sections, 23 equations, 1 figure, 1 table.

Table of Contents

  1. Introduction
  2. Theoretical formalism
  3. Group-theoretical analysis
  4. DFT results
  5. Discussion and summary

Figures (1)

  • Figure 1: Anisotropic charge-to-spin conversion ratio $\Theta$ at the Fermi energy as a function of $(\theta, \varphi)$ for the CuF$_2$ (a), FeSb$_2$ (b), K$_2$Ru$_8$O$_{16}$ (c), and RuO$_2$ (d). Note that, the Fermi energy for the semiconductor CuF$_2$ is at the $0.1$ eV below the valence band maximum.