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MA: Fachverband Magnetismus

MA 17: Poster Session I

MA 17.26: Poster

Tuesday, March 8, 2016, 09:30–12:30, Poster B1

Development and Commissioning of a Multi-Frequency FMR Setup — •Martin Buchner, Taddäus Schaffers, and Andreas Ney — Johannes Kepler Universität, Linz, Austria

Ferromagnetic resonance spectroscopy is used to measure dynamic magnetic properties. Furthermore, a precise determination of the g-factor by analyzing the FMR signals’ frequency dependence is possible [1]. Ferromagnetic excitation is achieved by inducing a microwave in the sample system (in this case a permalloy film). For microwave coupling commonly cylindrical resonators are used. However, the frequency range achieved by those is limited. In this contribution we present a setup which replaces the resonator by a coaxial cable that is short-circuited at one end and therefore exhibits standing wave behavior. At this end the microwave is induced into the sample. Thus, with the method shown, measurements in a wider frequency range are possible. A further advantage is the accessibility of the sample which enables to measure other properties like electric and magneto resistance as well as the inverse spin Hall effect as a measure for spin pumping at the same time.

[1] F. M. Römer et al. Appl. Phys. Lett. 100, 092402 (2012).