Regensburg 2016 – scientific programme
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MA: Fachverband Magnetismus
MA 17: Poster Session I
MA 17.25: Poster
Tuesday, March 8, 2016, 09:30–12:30, Poster B1
Spatially resolved ferromagnetic resonance (FMR) using X-rays and thermal excitation — •Taddäus Schaffers1,2, Ralf Meckenstock2, Detlef Spoddig2, Andreas Ney1, Christian Schöppner2, Hendrik Ohldag3, Stefano Bonetti4, and Michael Farle2 — 1Johannes Kepler University Linz, Austria — 2University of Duisburg-Essen, Germany — 3SSRL, SLAC National Accelerator Laboratory, Menlo Park, CA — 4Stanford University, CA, USA
In order to study local magnetic properties of micro-sized samples with FMR it is necessary to use a different kind of modulation or detection than in the conventional FMR measurements. By detecting the FMR with a microresonator it is possible to detect down to 106 spins [1]. Using thermal modulation instead of magnetic field modulation a spatial resolution of 110 nm is achieved and local magnetic properties are measured [2]. We combine thermal excitation with microresonator detection which enables us to study the influence of inhomogeneous stray fields on the FMR position and linewidth of two perpendicular Co-microstripes and compare the results to the integral detection. An alternative way to measure spatially resolved FMR is to change the detection mechanism from measuring the reflectected microwave power to using X-rays. By doing this it is possible to measure with a spatial resolution down to 35 nm [3].
[1]Narkowicz,et.al.,J. Magn. Res. 175(2005)275
[2]Meckenstock, Rev Sci Instrum. 79(2008).041101
[3]Bonetti,Rev Sci Instrum. 86(2015)093703