Dresden 2011 – wissenschaftliches Programm
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KR: Fachgruppe Kristallographie
KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)
KR 5.105: Poster
Dienstag, 15. März 2011, 10:45–13:00, P2
Detection of ferromagnetic resonance by optical reflectance — •Marc Möller1, Ralf Meckenstock2, and Josef Pelzl1 — 1Institute of Experimental Physics, Ruhr-University Bochum, Bochum, Germany — 2Experimental Physics, University Duisburg-Essen, Duisburg, Germany
The absorption of microwave radiation by ferromagnetic resonance (FMR) of a magnetic sample results in heat being dissipated inside the sample. This mechanism can be utilized to generate thermal waves by amplitude modulation of the microwave radiation. These thermal waves periodically modify the temperature dependent properties of the sample like the optical reflectance. Here we present results of the detection of FMR in the optical reflectance at the sample surface. A 10 to 100 nm thin, epitaxial Fe film is mounted inside a microwave cavity and a focused laser beam is reflected off its surface, such that the FMR spectrum can be recorded and be compared to FMR spectra measured using the magneto-optical Kerr effect (MOKE). The dependence of the reflectance changes on the frequency of the microwave amplitude modulation are used to investigate thermal properties of the film and the film/substrate interface, including the thermal contact resistance.