Skyrmion Crystal in a Microwave Field

TL;DR

This paper investigates how microwave fields influence skyrmion lattices in 2D ferromagnetic films, revealing resonant magnetization oscillations and a single-stage melting transition of the skyrmion crystal.

Contribution

It provides a detailed analysis of the dynamic response and melting behavior of skyrmion lattices under microwave excitation using a classical spin model.

Findings

Magnetization exhibits Rabi-like oscillations at resonance.

Resonant microwaves induce melting of the skyrmion lattice.

A single-stage melting transition is observed.

Abstract

Temperature and field dependences of the frequencies of uniform modes of the skyrmion lattice in a 2D ferromagnetic film with Dzyaloshinskii-Moriya interaction, as well as their damping, are computed within the model of classical spins. We show that the magnetization of the film exhibits Rabi-like oscillations when subjected to the microwave field at resonance with the low-frequency mode. Melting of the skyrmion lattice by resonant microwaves is investigated in terms of the time dependence of the orientational and translational order parameters. A distinct single-stage melting transition has been observed.