Spin pumping from a ferromagnetic insulator into an altermagnet

TL;DR

This paper investigates how spin pumping from a ferromagnetic insulator into an altermagnet varies with crystallographic orientation and spin-orbit coupling, revealing conditions for enhanced spin current generation.

Contribution

It introduces the first detailed analysis of spin injection into altermagnets, highlighting the effects of orientation and spin-orbit coupling on spin pumping behavior.

Findings

Spin pumping is orientation-dependent in altermagnets.

Interfacial Rashba spin-orbit coupling can magnify spin pumping.

Optimal spin-orbit coupling enhances spin current by an order of magnitude.

Abstract

A class of antiferromagnets with spin-polarized electron bands, yet zero net magnetization, called altermagnets is attracting increasing attention due to their potential use in spintronics. Here, we study spin injection into an altermagnet via spin pumping from a ferromagnetic insulator. We find that the spin pumping behaves qualitatively different depending on how the altermagnet is crystallographically oriented relative the interface to the ferromagnetic insulator. The altermagnetic state can enhance or suppress spin pumping, which we explain in terms of spin-split altermagnetic band structure and the spin-flip probability for the incident modes. Including the effect of interfacial Rashba spin-orbit coupling, we find that the spin-pumping effect is in general magnified, but that it can display a non-monotonic behavior as a function of the spin-orbit coupling strength. We show that there exists an optimal value of the spin-orbit coupling strength which causes an order of magnitude increase in the pumped spin current, even for the crystallographic orientation of the altermagnet which suppresses the spin pumping.