Magnetic Properties of Chemical Vapour Deposited Cobalt Dope Gamma Iron Oxide Thin Films

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Abstract
Magnetic properties of chemical vapour deposited (CVD) Fe3O4 and γ-Fe2O3 obtained by co-pyrolysis of ferric and cobaltus acetyl acetonate complexes are described. Saturation magnetization, remanent magnetization and coercivity value of 3.7 kG, 2.2 kG and 820 Oe respectively have been obtained for Co-γ Fe2O3 films. Chemically vapour deposited Co-Fe3O4 films are laterally inhomogeneous with only a fraction of Co2+ ions at octahedral sites (B sites) of spinnel ferrite and excess Co2+ ions distributed in the interstitial matrix. Oxidation conversion to γ-Fe2O3 phase at temperatures above 350°C lead to Co2+ ion diffusion to B sites with activation energy of 0.27 eV. Consequent increase in magneto-crystalline anisotropy results in considerable enhancement in coercivity.

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