Berlin 2015 – wissenschaftliches Programm
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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 Holuj1,2, Andreas Kehlberger1,2, Mathias Kläui1,2, and Gerhard Jakob1,2 — 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).