Abstract
Epitaxial spinel ferrite CoFe2O4 and NiFe2O4 thin films and bilayers of NiFe2O4 and CoFe2O4 have been grown by pulsed laser deposition on (001)-oriented SrTiO3 and MgO substrates. Both the single layer thin films showed epitaxial growth on MgO substrates with out-of-plane magnetic easy axis, originating from the out-of-plane compressive strain and negative magnetostriction constant. However, films on SrTiO3 substrates exhibited a magnetic easy axis along the in-plane. Magnetic hysteresis loops showed intermediate shape between magnetically hard CoFe2O4 and magnetically soft NiFe2O4 without two-step switching. Interdiffusion between spinel phases was suppressed using a blocking layer of MgO.
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