Abstract
Epitaxial spinel cobalt ferrite thin films have been prepared by spin-coating method. <111>-axis in-plane and <111>-axis out-of-plane oriented films are prepared on a-plane and c-plane sapphire substrates, respectively. The key process is to fabricate a layer of α-Fe2O3 precursor film first. The final cobalt ferrite film is formed by coating the precursor film with Cobalt nitrate solution and subsequently activating the topotactic reactive diffusion by thermal annealing. In-plane magnetic anisotropy has been confirmed in the <111> in-plane oriented film. This process enables the fabrication of epitaxial cobalt ferrite film with desired orientations without utilizing expensive physical vapor deposition systems.
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