Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 8: Magnetic Coupling Phenomena / Exchange Bias

MA 8.1: Vortrag

Montag, 23. März 2009, 15:15–15:30, HSZ 401

Exchange bias for a ferromagnetic film coupled to a spin glass — •Ulrich Nowak¹ and Klaus Usadel² — ¹Fachbereich Physik, Universität Konstanz — ²Fachbereich Physik, Universität Duisburg-Essen

For a model system consisting of a ferromagnetic layer exchange coupled to a spin glass extensive Monte Carlo simulations are performed. For the spin glass the standard short range Gaussian model is used. Exchange bias is observed as a result of a frozen spin glass state. The exchange bias fields are calculated for different temperatures, cooling fields and thicknesses of the spin glass layer and the training effect is investigated. A major result of our simulations is that the bias field decreases with increasing strength of the cooling field in qualitative agreement with recent experiments.