Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 6: Magnetic Thin Films I (Heusler Alloys)
MA 6.14: Vortrag
Montag, 22. März 2010, 18:00–18:15, H10
Magnetic properties of PdFe alloys — •Melanie Ewerlin1, Stefan Buschhorn1, Bastian Pfau2, Christian Günther2, Stefan Heinze2, Stefan Eisebitt2, and Hartmut Zabel1 — 1Institut für Experimentalphysik IV, Ruhr-Universität Bochum, 44780 Bochum — 2Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 14109 Berlin
We investigate the itinerant ferromagnetic system Pd1-xFex for different compositions with x=3.4-7.2. The Fe atoms provide a strong molecular field and trigger the alloy to a ferromagnetic state by polarization of the Pd atoms. This polarization effect is directly proven by x-ray magnetic circular dichroism experiments, which allow element specific magnetization measurements by resonantly tuning the x-ray energy. We are able to detect a clear magnetic dichroism signal both at the Fe L-edge and the Pd M-edge. Magnetic small angle x-ray scattering experiments at the Fe L-edge reveal a domain size of approximately 150nm in the samples. The shape of the hysteresis loops, magnetization curves and magnetization relaxation measurements measured with SQUID indicate the coexistence of long range ferromagnetism and also cluster magnetism in the alloy. Soft x-ray photon correlation spectroscopy measurements are performed to reveal both domain fluctuations and also possible spin fluctuations of Fe nanoclusters embedded in the Pd-matrix.