Dresden 2014 – scientific programme
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.67: Poster
Friday, April 4, 2014, 10:30–13:30, P2
Dependence of Ferromagnetic Resonance Behaviour on Chemical Disorder in Fe60Al40 Thin Films — •Rantej Bali1, Tobias Schneider1,3, Jakob Gollwitzer1, Simon Rupp1, Falk Meutzner1,2, Richard Boucher2, Kay Potzger1, Jürgen Bauch2, Jürgen Fassbender1,3, Kilian Lenz1, and Jürgen Lindner1 — 1Institut für Ionenstrahlphysik und Materialforschung, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany — 2Institut für Werkstoffwissenschaft, Technische Universität Dresden, 01069 Dresden, Germany — 3Institut für Festkörperphysik, Technische Universität Dresden, 01069 Dresden, Germany
We report on the influence of chemical disorder in Fe60Al40 thin films on their ferromagnetic resonance. Chemical disorder leads to increased nearest neighbour Fe-Fe magnetic interactions and plays a crucial role in inducing ferromagnetism. The saturation magnetization increases from 20 kAm−1 for the chemically ordered film to 780 kAm−1 for disordered films. Disorder was induced by irradiation of Ne+ ions, and the depth-distribution of disorder was controlled by adjusting the ion-energy and -fluence. For moments aligned within the film plane, the resonant linewidth decreases with increasing ion-energy in the range from 2.5 to 30 keV, for a fixed ion-fluence. In-plane magnetic anisotropy is negligible in all cases. The linewidths for in-plane moment alignment are much larger than in materials that do not exhibit disorder induced ferromagnetism. These results may be explained by enhanced two-magnon scattering due to the presence of random defects, and help in preparing thin films with tailored spin-wave dynamic properties.