Dresden 2011 – wissenschaftliches Programm
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KR: Fachgruppe Kristallographie
KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)
KR 5.74: Poster
Dienstag, 15. März 2011, 10:45–13:00, P2
Micromagnetic model for exchange coupled SmCo5/Fe/SmCo5-trilayers — •Martin Kopte, Simon Sawatzki, Marietta Seifert, Ludwig Schultz, and Volker Neu — IFW Dresden, Germany
The enhancement of remanence and energy density in exchange coupled hard/soft magnets has reached a new record value of 300 kJ/m3 in recently prepared epitaxial SmCo5/Fe/SmCo5-trilayers. A micromagnetic model has been adapted to such a trilayer system, which simulates the full hysteresis in a one-dimensional spin chain approach and the effect of the intermediate Fe-layer thickness dFe has been evaluated. The simulations have been carried out using the programs OOMMF and MicroMagus, after carefully checking the input parameters for stable solutions. Calculated hysteresis curves are in very good agreement with the experimental results, and reproduce the characteristic decay of nucleation field and coercive field with increasing dFe. A modification of the model to include gradual changes of the intrinsic magnetic parameters at the interface (mimicking the effect of a diffusion profile as a result of the deposition process) has consequences on the qualitative agreement between model and experiment.