Dynamic Domains Above the Ferromagnetic Resonance Instability

TL;DR

This paper introduces a simplified model demonstrating the existence of stable dynamic domain states in ferromagnets under strong external fields, explaining experimental power absorption reductions above instability.

Contribution

It presents a new simplified model showing stable dynamic domain solutions in ferromagnetic systems driven by external fields, linking theory with experimental observations.

Findings

Stable domain states exist above the homogeneous magnetisation instability.

Dynamic domains explain the reduction in power absorption observed experimentally.

The model's relevance to real ferromagnets is discussed.

Abstract

A simplified model is introduced and analysed to show, that for the Landau-Lifshitz equation stable, steady state solutions of domain type exist in ferromagnetic systems, strongly driven by external transverse fields. These dynamic domain states are able to describe the drastic reduction of the power absorption found experimentally above the instability of the homogeneous magnetisation. The excitations of the domain states are presented and the relevance of the model for real ferromagnets is discussed.