Abstract
The CoO antiferromagnetic ordering in exchange-biased (001) ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}/\mathrm{CoO}$ superlattices has been determined as a function of temperature and magnetic field using neutron diffraction methods. The Co spins preferentially align in domains in which the spins are perpendicular to the net ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$ moment direction. This 90\ifmmode^\circ\else\textdegree\fi{} orientation between the ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$ and CoO spins is a direct consequence of the interfacial exchange coupling giving rise to exchange biasing, as is not observed in a comparable MgO/CoO superlattice.
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