Abstract
Quasi-two-dimensional magnetite epitaxial thin films have been synthesized by pulsed laser deposition technique at various oxygen pressures. The saturation magnetizations of the magnetite films were found to decrease from 425emu/cm3, which is close to the bulk value, to 175emu/cm3 as the growth atmospheres varying from high vacuum (∼1×10−8mbar) to oxygen pressure of 1×10−3mbar. The ratio of the Fe3+ to Fe2+ increases from 2 to 2.7 as oxygen pressure increasing shown by XPS fitting, which weakens the net magnetic moment generated by Fe2+ at octahedral sites as the spins of the Fe3+ ions at octahedral and tetrahedral sites are aligned in antiparallel. The results offer direct experimental evidence of the influence to the Fe3+/Fe2+ ratio and the magnetic moment in magnetite epitaxy films by oxygen pressure, which is significant for spintronic applications.
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