Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 20: Cryotechnique & Measuring Devices: Poster Session
TT 20.5: Poster
Montag, 7. März 2016, 15:00–18:00, Poster D
Low temperature measurements of thermal conductivity and thermal diffusivity of thin metal films using the 3ω method — •Sofia Blanter1, Sasmita Srichandan1, Denis Kochan2, and Christoph Strunk1 — 1Institut für experimentelle und angewandte Physik, Universität Regensburg, Universitätstr. 31, 93053 Regensburg — 2Universität Regensburg, Institut I - Theoretische Physik, Universitätsstraße 31, 93053 Regensburg
We present measurements of thermal conductivity and thermal diffusivity for thin suspended membranes. The measurements are performed on 500 nm thick SiN membranes using the 3ω method [1]. We pass an AC current at a frequency ω through a metal transducer on top of the membrane. This applied current generates an oscillating heat flux through the membrane. This will create a modulation on top of the measured voltage through the transducer, at a frequency of 3ω.
By depositing thin metal films on the backside of the membranes, we are able to obtain thermal properties for thin metal films once the plain membrane is characterized.
We derive a model from the two-dimensional heat diffusion equation, which allows us to extract both the thermal conductivity and thermal diffusivity of the sample.
D. Cahill and R. Pohl,
PRB 35, 4067 (1987).