Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5491061 | Journal of Magnetism and Magnetic Materials | 2017 | 5 Pages |
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 425Â emu/cm3, which is close to the bulk value, to 175Â emu/cm3 as the growth atmospheres varying from high vacuum (â¼1Â ÃÂ 10â8Â mbar) to oxygen pressure of 1Â ÃÂ 10â3Â mbar. 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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Junran Zhang, Wenqing Liu, Minhao Zhang, Xiaoqian Zhang, Wei Niu, Ming Gao, Xuefeng Wang, Jun Du, Rong Zhang, Yongbing Xu,