Copper ferrite films have been deposited on (100) MgO substrates by pulsed-laser deposition. The oxygen pressure used in deposition was varied from 1to120mTorr with the substrate temperature fixed at 700°C. Magnetization values are measured to increase with oxygen pressure, reaching a maximum value of 2480G, which is a 42% increase over the bulk equilibrium value. Extended x-ray absorption spectroscopy shows that the Cu cation inversion δ [defined as (Cu1−δFeδ)tet[CuδFe2−δ]octO4] decreases monotonically from 0.72 to 0.55 with increasing saturation magnetization.
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Yang et al. (2005) studied this question.
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