Spatial Antiferromagnetic Spin Texture as a Nano-Oscillator

TL;DR

This paper presents a theoretical analysis of a confined antiferromagnetic spin texture that exhibits self-oscillations, effectively functioning as a magnetic nano-oscillator with characterized oscillation properties and topological parameters.

Contribution

It introduces a novel theoretical framework for understanding self-oscillations in topological antiferromagnetic spin textures, including derivation of oscillation equations and calculation of topological masses.

Findings

Derived equations for free oscillations of the spin texture

Calculated oscillation frequency, period, and amplitude

Determined topological and inertial masses, and total energy

Abstract

We report a theoretical study of the localized spatial magnetization configuration, which is a confined spin configuration of the target skyrmion/hopfion type in an antiferromagnet with perpendicular magnetic anisotropy, and then we solve the particular problem of self-oscillations of such a topological spin texture. Using the energy approach, a self-consistent account of inhomogeneity of the characteristics of the topological magnetic spin texture was carried out. On this basis, the equation of free oscillations of the confined spin configuration magnetization was derived and its quasi-classical solution was found. For a thin ring spin texture, the frequency, period of oscillations and relative amplitude of the main tone of oscillations are found. For the first time, we determined the topological mass, inertial mass and total energy of the main tone of oscillations of such spatial spin texture. The self-oscillatory process of a spatial spin texture is interpreted as a magnetic nano-oscillator.