Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 9: Transport: Spintronics and Magnetotransport (jointly with HL, MA)

TT 9.1: Talk

Monday, March 16, 2015, 09:30–09:45, A 053

Low Temperature THz Spectroscopy and Transport in Nanostructures — •Julian Braun, Sergej Andreev, Elke Scheer, and Torsten Pietsch — Universität Konstanz, Konstanz, Germany

Theoretical predictions [1] suggest a new source for THz radiation, based on a spin relaxation in metallic heterocontacts. In a dilute ferromagnet a spin imbalance can be created by a spin polarized current originating in a ferromagnet of opposite magnetization. Relaxation in the energetically more favorable spin distribution should occur by emission of a photon with an energy in the THz range.

We constructed a compact cw-THz spectrometer working at temperatures down to 4 K and a frequency range from 0.1 GHz to 2000 GHz. Installed in a vector magnet we can thereby correlate magnetotransport measurements with the spectroscopic analysis to investigate the spin imbalance in metallic heterocontacts. Additionally characterization measurement on different metallic and superconducting samples will be presented.

[1] A.M. Kadigrobov et al., Europhys. Lett. 67, 948-954 (2004).