Abstract
(100)- and (111)-oriented Fe3O4/CoO superlattices were prepared on MgO(100) and α-Al2O3(0001) singlecrystalline substrates, respectively, by activated reactive vapor deposition method. X-ray diffraction analysis suggests that the lattice spacing along the growth direction was contracted for the CoO layer but expanded for the Fe3O4 layer probably due to the lattice mismatch between these layers. The magnetostriction of CoO layers induced in-plane and perpendicular magnetic anisotropy in (100)- and (111)-oriented superlattices, respectively. Coercive force along the magnetic easy axis was increased with increasing the thickness of the CoO layer but decreased with increasing that of the Fe3O4 layer. Strong magnetic coupling between Fe3O4 and CoO layers made the Noel temperature of the CoO layer higher and showed the ferrimagnetic/antiferromagnetic exchange anisotropy.
