Oxygen pressure-tuned epitaxy and magnetic properties of magnetite thin films

Junran Zhang; Wenqing Liu; Minhao Zhang; Xiaoqian Zhang; Wei Niu; Ming Gao; Xuefeng Wang; Jun Du; Rong Zhang; Yongbing Xu

doi:10.1016/j.jmmm.2017.02.032

Oxygen pressure-tuned epitaxy and magnetic properties of magnetite thin films

Junran Zhang, Wenqing Liu, Minhao Zhang, Xiaoqian Zhang, Wei Niu, Ming Gao, Xuefeng Wang^*, Jun Du, Rong Zhang, Yongbing Xu

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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 425 emu/cm³, which is close to the bulk value, to 175 emu/cm³ as the growth atmospheres varying from high vacuum (∼1 × 10⁻⁸ mbar) to oxygen pressure of 1 × 10⁻³ 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.

Original language	English
Pages (from-to)	472-476
Number of pages	5
Journal	Journal of Magnetism and Magnetic Materials
Volume	432
Early online date	22 Feb 2017
DOIs	https://doi.org/10.1016/j.jmmm.2017.02.032
Publication status	Published - 15 Jun 2017

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10.1016/j.jmmm.2017.02.032

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title = "Oxygen pressure-tuned epitaxy and magnetic properties of magnetite thin films",

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 425 emu/cm3, which is close to the bulk value, to 175 emu/cm3 as the growth atmospheres varying from high vacuum (∼1 × 10−8 mbar) to oxygen pressure of 1 × 10−3 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.",

author = "Junran Zhang and Wenqing Liu and Minhao Zhang and Xiaoqian Zhang and Wei Niu and Ming Gao and Xuefeng Wang and Jun Du and Rong Zhang and Yongbing Xu",

year = "2017",

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doi = "10.1016/j.jmmm.2017.02.032",

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T1 - Oxygen pressure-tuned epitaxy and magnetic properties of magnetite thin films

AU - Zhang, Junran

AU - Liu, Wenqing

AU - Zhang, Minhao

AU - Zhang, Xiaoqian

AU - Niu, Wei

AU - Gao, Ming

AU - Wang, Xuefeng

AU - Du, Jun

AU - Zhang, Rong

AU - Xu, Yongbing

PY - 2017/6/15

Y1 - 2017/6/15

N2 - 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 425 emu/cm3, which is close to the bulk value, to 175 emu/cm3 as the growth atmospheres varying from high vacuum (∼1 × 10−8 mbar) to oxygen pressure of 1 × 10−3 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.

AB - 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 425 emu/cm3, which is close to the bulk value, to 175 emu/cm3 as the growth atmospheres varying from high vacuum (∼1 × 10−8 mbar) to oxygen pressure of 1 × 10−3 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.

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SN - 0304-8853

VL - 432

SP - 472

EP - 476

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

ER -

Oxygen pressure-tuned epitaxy and magnetic properties of magnetite thin films

Abstract

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