Probing nonlinear spin dynamics in canted easy-plane antiferromagnets using spin-rectification effects

TL;DR

This paper explores nonlinear spin dynamics in canted antiferromagnets using spin-rectification effects, revealing enhanced excitation efficiency, detection methods, and nonlinear phenomena like saturation and redshift, advancing antiferromagnetic spintronics.

Contribution

It demonstrates how spin-rectification can probe nonlinear spin dynamics in canted antiferromagnets, highlighting the role of Dzyaloshinskii-Moriya interaction and nonlinear effects.

Findings

Enhanced excitation efficiency via Dzyaloshinskii-Moriya interaction

Detection of antiferromagnetic dynamics through spin-Hall magnetoresistance and bolometric effects

Observation of saturation and redshift in high-power regimes

Abstract

We investigate spin-rectification phenomena in canted antiferromagnets, closely connected to the family of altermagnetic materials. Our results show that excitation efficiency is significantly enhanced by the Dzyaloshinskii-Moriya interaction. Antiferromagnetic dynamics can be detected through spin-Hall magnetoresistance and bolometric effects, with an efficiency reaching up to mV/W. The rectified voltage shape is influenced by both the symmetry of the exciting torques, detection mechanisms (continuous spin-pumping and spin-Hall magnetoresistance), and the antiferromagnetic crystalline axis. Under high pumping power, we observe a saturation effect related to Suhl-like spin-wave instabilities and a nonlinear redshift of the antiferromagnetic resonance. These findings open new avenues for studying nonlinear dynamics in antiferromagnetic and altermagnetic spintronic devices.