Berlin 2018 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 47: Poster Session II

MM 47.43: Poster

Mittwoch, 14. März 2018, 18:30–19:45, Poster C

Characterization of manganite-based building-blocks for thermal circuitry via transient thermoreflectometry — •Roland Potthast¹, Dennis Meyer¹, Alexandr Belenchuk², and Henning Ulrichs¹ — ¹I. Physikalisches Institut, Georg-August Universität Göttingen, Germany — ²Institute of Electronic Engineering and Nanotechnology of the Academy of Sciences of Moldova, Chisinau, Moldova

We discuss the implementation and application of a transient thermoreflectometry (TTR) technique [1] for the analysis of thermal properties of multilayer samples. In TTR, a pump laser heats the surface, and the time-dependent change of the surface temperature is monitored by measuring the reflectivity of the probe laser. Our temperature-controlled setup uses a high-fluence fs-laser (1030 nm) as a pump, and a continuous wave diode laser (639 nm) as a probe. We apply the TTR-method in order to determine thermal properties of LaCaMnO-bilayers. The two manganite layers feature phase transitions at slightly different critical temperatures. We attempt to exploit this property in order to enable thermal rectification, as suggested by M. Peyrard [2], and numerical finite-difference time-domain simulation.

We acknowledge financial support by the DFG within the CRC 1073 Atomic scale control of energy conversion.

[1] F. Döring, A. Major, C. Eberl, H.-U. Krebs, Appl. Phys. A, 122, 872 (2016).

[2] M. Peyrard, EPL 76, 49 (2006).