Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)

MA 19.23: Poster

Dienstag, 15. März 2011, 10:45–13:00, P2

Morphology Induced Magnetic Anisotropy of Thin Films Deposited on Nanoscale Ripple Substrates — •Michael Körner¹, Maciej Oskar Liedke¹, Kilian Lenz¹, Mukesh Ranjan¹, Monika Fritzsche¹, Stefan Facsko¹, Jürgen Fassbender¹, Ulrich von Hörsten², Bernhard Krumme², and Heiko Wende² — ¹Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), P.O. Box 510119, 01314 Dresden, Germany — ²Fakultät für Physik und CeNIDE, Universität Duisburg-Essen, 47048 Duisburg, Germany

Magnetic properties of thin films are influenced by the morphology of substrates with periodically modulated patterns on the nanometer scale [1]. These well ordered surface modulations (ripple) can be produced by low energy ion beam erosion and are tuneable over a wide range [2]. Thin magnetic films deposited on these ripple surfaces repeat the surface profiles of these patterns and thus an additional uniaxial magnetic anisotropy is induced. This is shown for thin films of Fe, Co as well as the quasi-Heusler compound Fe₃Si. The magnetic anisotropy is determined by means of angular- as well as frequency-dependent ferromagnetic resonance measurements using a vector network analyzer. We find a strong uniaxial magnetic anisotropy induced by the ripple surface, which is superimposed on the cubic anisotropy in the case of single crystalline films.

This work is supported by DFG grant FA 314/6-1.

[1] M. Körner et al., Phys. Rev. B 80, 214401 (2009).

[2] J. Fassbender et al., New Journal of Physics 11, 125002 (2009).