Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.67: Poster

Freitag, 4. April 2014, 10:30–13:30, P2

Dependence of Ferromagnetic Resonance Behaviour on Chemical Disorder in Fe₆₀Al₄₀ Thin Films — •Rantej Bali¹, Tobias Schneider^1,3, Jakob Gollwitzer¹, Simon Rupp¹, Falk Meutzner^1,2, Richard Boucher², Kay Potzger¹, Jürgen Bauch², Jürgen Fassbender^1,3, 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.