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Autori: Florin Radu, Andreas Westphalen, Katharina Theis-Bröhl and Hartmut Zabel
Editorial: J. Phys.: Condens. Matter, 18, p.L29-L36, 2006.
While the principal features of the exchange bias between a ferromagnet and
an antiferromagnet are believed to be understood, a quantitative description
is still lacking. We show that interface spin disorder is the main reason for
the discrepancy of model calculations versus experimental results. Taking
into account spin disorder at the interface between the ferromagnet and the
antiferromagnet by modifying the well known Meiklejohn and Bean model, an
almost perfect agreement can be reached. As an example this is demonstrated
for the CoFe/IrMn exchange biased bilayer by analysing the azimuthal
dependence of magnetic hysteresis loops from MOKE measurements. Both
exchange bias and coercive fields for the complete 360◦ angular range are
reproduced by our model.
Cuvinte cheie: echange bias, magneto optical kerr effect, magnetism