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TT: Fachverband Tiefe Temperaturen

TT 73: Spincaloric Transport II (jointly with MA)

TT 73.7: Vortrag

Mittwoch, 18. März 2015, 16:30–16:45, H 0110

Thickness and temperature dependent thin film thermal conductance of YIG — •Christoph Euler¹, Paulina Holuj^1,2, Andreas Kehlberger^1,2, Mathias Kläui^1,2, and Gerhard Jakob^1,2 — ¹Institut für Physik, Johannes Gutenberg-Universität mainz, Staudinger Weg 7, 55128 Mainz — ²Graduate School of Excellence ’Materials Science in Mainz’, Staudinger Weg 8, 55128 Mainz

Thin film YIG (Y₃Fe₅O₁₂) is commonly used in spin-caloritronics, as it is a prototype material for experiments on thermally generated pure spin currents and the spin Seebeck effect. However, bulk values of the thermal conductance are often used to determine temperature gradients even if the actual experimental geometry employs thin films. The 3ω method is an established technique to measure the cross-plane thermal conductance of thin films, but it is inapplicable in YIG/GGG (Ga₃Gd₅O₁₂) 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 obtained from the 3ω method. This allows us to extract the temperature dependent thermal conductance of thin film YIG between room temperature and 10 K even for films in the hundreds of nanometer thickness range, which are of major importance for experiments in the field of spin-caloritronics. Moreover, our developed generic data evaluation scheme is suitable to analyze all thin film 3ω measurements, which have so far not been accessible for analysis using the 3ω method. We gratefully acknowledge financial support by DFG (Ja821/7-1) and (GSC 266).