Heat diffusion in magnetic superlattices on glass substrates

TL;DR

This paper investigates heat diffusion in metallic magnetic superlattices on glass substrates using pump-probe experiments and modeling, revealing the importance of interface conductance and the effect of a glass layer on temperature modulation.

Contribution

It introduces a Green's function-based model for heat diffusion in thin layered structures, accounting for interface conductance and substrate effects, validated by experimental data.

Findings

Heat diffusion is well described by a cylindrical symmetry Green's function model.

Adding a glass layer affects the frequency dependence of temperature modulation.

Interface conductance influences demagnetization patterns.

Abstract

Pump-probe experiments and polarizing microscopy are applied to examine temperature and heat flow in metallic magnetic superlattices on glass substrates. A model of heat diffusion in thin layers for cylindrical symmetry, equivalent to the Green's function method, gives a good description of the results. The frequency dependence of temperature modulation shows that a glass layer should be added to the sample structure. The demagnetization patterns are reproduced with a Green's function that includes an interface conductance.