Microwave excitations and hysteretic magnetization dynamics of stripe domain films

TL;DR

This study investigates the microwave excitations and hysteretic magnetization dynamics in stripe domain FeNi films, revealing mode-specific resonance behaviors and the influence of local magnetization on these properties.

Contribution

It provides new insights into the dynamic hysteresis and resonance modes of stripe domain films, combining experimental results with micromagnetic simulations.

Findings

Magnetizations depend on stripe domain orientation.

Microwave properties show dynamic hysteresis before saturation.

Resonance modes are influenced by local magnetization.

Abstract

FeNi films with the stripe domain (SD) pattern are prepared by electrodeposition and sputtering methods. The magnetic domain, static magnetic parameters, and quality factor, as well as dynamic properties of the two films, are respectively performed. The results show the magnetizations of the film were dependent on the direction of SD, and the rotation of the SD is lagging behind the magnetization reversal. The microwave properties of the SD emerge dynamic hysteresis before the saturation magnetic field. These microwave properties are selectively excited with acoustic mode, optical mode, and spin-wave mode. The frequency and intensity of different resonance modes of stripe domain are determined by the local magnetization. The magnetization variations and the rotation of SD of different modes are further illuminated by the micromagnetic simulation. The magnetic anisotropy and the resonance intensity of permeability of different modes were finally described by the modified resonance equations.