Abstract
We investigated the magnetization process of epitaxial MgO(001)∕γ-Fe2O3∕MgO∕Fe(001) multilayers. When the thickness of a MgO spacer layer was less than 1.0nm, an antiferromagnetic interlayer exchange coupling (IEC) between Fe(001) and γ-Fe2O3(001) layers appeared. Unlike the oscillatory IEC in metallic systems, the sign of the observed IEC is only antiferromagnetic. The strongest coupling constant was found to be around −1.8erg∕cm2 at the MgO thickness of 0.5nm. This antiferromagnetic coupling via the insulating MgO layer is possibly understood within the framework of spin polarized tunneling models.
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