Structural and magnetic transformation in Fe1-xCo xOv films grown by molecular beam epitaxy

Lance Horng; G. Chern; P. C. Kang; M. C. Chen; D. S. Lee

doi:10.1109/TMAG.2004.832250

Structural and magnetic transformation in Fe_1-xCo _xO_v films grown by molecular beam epitaxy

Lance Horng, G. Chern, P. C. Kang, M. C. Chen, D. S. Lee

Department of Physics

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

7 Citations (Scopus)

Abstract

Fe_1-xCo_xO_y (0 ≤ x ≤ 1, 1 ≤ y ≤ 4/3) mixture oxide films are grown, with epitaxial quality, on MgO(001) substrates by molecular beam epitaxy. The X-ray diffraction result along (001) plane is similar to Fe₃O₄ for the films with x < 0.5 (Fe rich) and is similar to CoO for the films with x > 0.5 (Co rich). An abrupt change, over 2%, on the lattice spacing is observed around Fe/Co ∼ 1(x = 0.5) suggesting a phase transformation from spinel to rocksalt. A fast suppression of the saturation magnetization is found markedly different from the bulk materials as the Co ratio increases. Crystalline anisotropy and anomalous magnetic properties are affected substantially by Co ions. These unique magnetic behaviors of Fe-Co-O films are believed to be related to cation distribution in spinel structure originated by the low-temperature process of thin-film fabrication.

Original language	English
Pages (from-to)	2799-2801
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	40
Issue number	4 II
DOIs	https://doi.org/10.1109/TMAG.2004.832250
Publication status	Published - 2004 Jul 1

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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title = "Structural and magnetic transformation in Fe1-xCo xOv films grown by molecular beam epitaxy",

abstract = "Fe1-xCoxOy (0 ≤ x ≤ 1, 1 ≤ y ≤ 4/3) mixture oxide films are grown, with epitaxial quality, on MgO(001) substrates by molecular beam epitaxy. The X-ray diffraction result along (001) plane is similar to Fe3O4 for the films with x < 0.5 (Fe rich) and is similar to CoO for the films with x > 0.5 (Co rich). An abrupt change, over 2%, on the lattice spacing is observed around Fe/Co ∼ 1(x = 0.5) suggesting a phase transformation from spinel to rocksalt. A fast suppression of the saturation magnetization is found markedly different from the bulk materials as the Co ratio increases. Crystalline anisotropy and anomalous magnetic properties are affected substantially by Co ions. These unique magnetic behaviors of Fe-Co-O films are believed to be related to cation distribution in spinel structure originated by the low-temperature process of thin-film fabrication.",

author = "Lance Horng and G. Chern and Kang, {P. C.} and Chen, {M. C.} and Lee, {D. S.}",

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T1 - Structural and magnetic transformation in Fe1-xCo xOv films grown by molecular beam epitaxy

AU - Horng, Lance

AU - Chern, G.

AU - Kang, P. C.

AU - Chen, M. C.

AU - Lee, D. S.

PY - 2004/7/1

Y1 - 2004/7/1

N2 - Fe1-xCoxOy (0 ≤ x ≤ 1, 1 ≤ y ≤ 4/3) mixture oxide films are grown, with epitaxial quality, on MgO(001) substrates by molecular beam epitaxy. The X-ray diffraction result along (001) plane is similar to Fe3O4 for the films with x < 0.5 (Fe rich) and is similar to CoO for the films with x > 0.5 (Co rich). An abrupt change, over 2%, on the lattice spacing is observed around Fe/Co ∼ 1(x = 0.5) suggesting a phase transformation from spinel to rocksalt. A fast suppression of the saturation magnetization is found markedly different from the bulk materials as the Co ratio increases. Crystalline anisotropy and anomalous magnetic properties are affected substantially by Co ions. These unique magnetic behaviors of Fe-Co-O films are believed to be related to cation distribution in spinel structure originated by the low-temperature process of thin-film fabrication.

AB - Fe1-xCoxOy (0 ≤ x ≤ 1, 1 ≤ y ≤ 4/3) mixture oxide films are grown, with epitaxial quality, on MgO(001) substrates by molecular beam epitaxy. The X-ray diffraction result along (001) plane is similar to Fe3O4 for the films with x < 0.5 (Fe rich) and is similar to CoO for the films with x > 0.5 (Co rich). An abrupt change, over 2%, on the lattice spacing is observed around Fe/Co ∼ 1(x = 0.5) suggesting a phase transformation from spinel to rocksalt. A fast suppression of the saturation magnetization is found markedly different from the bulk materials as the Co ratio increases. Crystalline anisotropy and anomalous magnetic properties are affected substantially by Co ions. These unique magnetic behaviors of Fe-Co-O films are believed to be related to cation distribution in spinel structure originated by the low-temperature process of thin-film fabrication.

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