Thermal conductance of thin film YIG determined using Bayesian statistics

Abstract

Thin film YIG (Y${}_3$Fe${}_5$O${}_{12}$) is a prototypical material for experiments on thermally generated pure spin currents and the spin Seebeck effect. The 3-omega method is an established technique to measure the cross-plane thermal conductance of thin films, but can not be used in YIG/GGG (Ga${}_3$Gd${}_5$O${}_{12}$) systems in its standard form. We use two-dimensional modeling of heat transport and introduce a technique based on Bayesian statistics to evaluate measurement data taken from the 3-omega method. Our analysis method allows us to study materials systems that have not been accessible with the conventionally used 3-omega analysis. Temperature dependent thermal conductance data of thin film YIG are of major importance for experiments in the field of spin-caloritronics. Here we show data between room temperature and 10 K for films covering a wide thickness range as well as the magnetic field effect on the thermal conductance between 10 K and 50 K.

References in corpus (2)

• Spin Seebeck insulator
• Temperature dependence of spin diffusion length and spin Hall angle in Au and Pt

Cited by in corpus (8)

• Critical suppression of spin Seebeck effect by magnetic fields
• Origin of the thickness-dependent low-temperature enhancement of spin Seebeck effect in YIG films
• Longitudinal spin Seebeck coefficient: heat flux vs. temperature difference method
• Criteria for accurate determination of the magnon relaxation length from the nonlocal spin Seebeck effect
• Probing length-scale separation of thermal and spin currents by nanostructuring YIG
• Thermal conductivity of thin insulating films determined by tunnel magneto-Seebeck effect measurements and finite-element modeling
• Thermal spin current generation in the multifunctional ferrimagnet Ga${}_{0.6}$Fe${}_{1.4}$O${}_3$
• Frequency-dependent Phonon-mediated Unidirectional Magnetoresistance in a Metal on an Insulator with Highly Nonequilibrium Magnons