Spin wave frequency hysteresis in Ir/Co/Pt multilayers with Dzyaloshinskii-Moriya interaction

TL;DR

This study investigates the static and dynamic magnetic properties of Ir/Co/Pt multilayers with Dzyaloshinskii-Moriya interaction, revealing hysteresis in spin wave frequencies linked to magnetic domain switching, with potential spin wave device applications.

Contribution

It provides combined experimental and theoretical insights into spin wave hysteresis caused by interfacial Dzyaloshinskii-Moriya interaction in multilayers.

Findings

Detection of large in-plane magnetic domains and stripe patterns.

Observation of hysteresis in spin wave frequencies via Brillouin Light Scattering.

Micromagnetic simulations explaining the hysteretic behavior.

Abstract

Results of extensive combined experimental and theoretical investigations on static and dynamic properties of Ir/Co/Pt multilayer with low uniaxial anisotropy and asymmetric Ir/Co and Co/Pt interfaces responsible for large interfacial Dzyaloshinskii-Moriya interaction (IDMI) are presented. Within longitudinal magneto-optical Kerr effect-based microscopy and magnetic force microscopy studies a complex magnetic configuration was detected: large in-plane magnetized domains of several dozen micrometers size were modulated by a weak stripe domain pattern with periods of about 100 nm. Using Brillouin Light Scattering spectrometry, the hysteresis of the Stokes and anti-Stokes peaks frequencies was observed as a function of the magnetic field. This hysteretic behavior associated with IDMI-induced asymmetry of spin waves dispersion is correlated with switching of the large macro-domains. Using micromagnetic simulations we determine field-dependent magnetization distributions and dispersion relations, proposing an explanation of the observed behavior. The investigated nanostructure can be used as non-volatile spin waves velocity switcher.