Odd-Parity-Wave Magnons and Nonrelativistic Thermal Edelstein Effect

TL;DR

This paper explores the unique spin textures and magnonic properties of odd-parity-wave magnets, revealing their potential for magnon spintronics through the nonrelativistic thermal Edelstein effect and novel spin polarization behaviors.

Contribution

It introduces minimal exchange-stabilized models of odd-parity-wave magnets with p- and f-wave magnon spin textures and demonstrates the existence of a nonrelativistic thermal Edelstein effect in these systems.

Findings

Magnon spin polarization can be restricted to a global axis in certain models.

The thermal Edelstein effect exists in p-wave magnets and depends on the partial-wave character.

Odd-parity-wave magnets are promising for magnon spintronics applications.

Abstract

Odd-parity-wave magnets are noncollinear compensated magnets with spin-split band structure in the absence of spin-orbit coupling and dipolar interactions. In contrast to altermagnets, their spin-polarized band structure breaks inversion symmetry, but preserves time-reversal symmetry rendering their spin texture odd in momentum space. Here, we study the spin dynamics of the magnetic texture and compute the band structure and spin polarization of magnons. We present minimal spin models of noncoplanar odd-parity-wave magnets purely stabilized by exchange interactions that host p- and f-wave spin textures for the magnetic excitations. We demonstrate that two of these models exhibit collinear spin textures, i.e., the magnon spin polarization is restricted to a global (quantization) axis independent of the momentum giving rise to single-component odd-parity-wave magnetism, previously associated primarily with coplanar ground states. Finally, the nonrelativistic magnonic thermal Edelstein effect -- a nonequilibrium magnetization induced by a temperature gradient -- is shown to exist for p-wave magnets in linear response and inherits its anisotropic angular dependence from the partial-wave character of the spin-polarized band structure. Our findings suggest that insulating odd-parity-wave magnets are promising candidates for magnon spintronics applications.