Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 4: Magnetic Coupling Phenomena; Exchange Bias
MA 4.7: Vortrag
Montag, 25. Februar 2008, 11:45–12:00, H 1028
Magnetic anisotropies in ferromagnetic and exchange-coupled systems on rippled surfaces — •Maciej Oskar Liedke1, Bartosz Liedke1, Daniel Markó1, Adrian Keller1, Arndt Mücklich1, Stefan Facsko1, Jürgen Fassbender1, Erik Čižmár2, Sergei Zvyagin2, and Joachim Wosnitza2 — 1FZ Dresden-Rossendorf, FWI, Bautzner Landstr. 128, 01328 Dresden, Germany — 2FZ Dresden-Rossendorf, HLD, Bautzner Landstr. 128, 01328 Dresden, Germany
The influence of a surface and interface modulation on the magnetic properties of ferromagnetic materials (Py, Fe and Co) and an exchange bias system (Py/FeMn) is studied. A periodic surface modulation (the so-called ripples) is achieved by low energy ion erosion. Subsequently the magnetic stack is deposited. Due to the film morphology a strong uniaxial anisotropy is induced in the ferromagnetic layers, which is fixed in its orientation along ripples elongation. In the case of the exchange bias system the direction of the induced unidirectional anisotropy can be varied by means of different field annealing cycles. For all mutual orientations both anisotropy contributions are superimposed independently. The angular dependence of the magnetization reversal behavior can be described perfectly by a coherent rotation model [1]. In addition, the magnitude of the uniaxial and the unidirectional anisotropy scales with the step density or wave length of the rippled substrate, which is in full agreement with theoretical predictions.
[1] M. O. Liedke et al., Phys. Rev. B 75, 220407(R) (2007)