Growth, Structure, and Magnetic Properties of gamma- Fe2O3 Epitaxial Films on MgO

Gao, Yufei; Kim, Yong J.; Thevuthasan, Suntharampillai; Chambers, Scott A.; Lubitz, P

doi:10.1063/1.364355

Growth, Structure, and Magnetic Properties of gamma- Fe2O3 Epitaxial Films on MgO

Journal Article · Tue Apr 01 04:00:00 UTC 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.364355· OSTI ID:1557651

Gao, Yufei ^[1]; Kim, Yong J. ^[2]; Thevuthasan, Suntharampillai ^[1]; ^[1]; Lubitz, P ^[3]

BATTELLE (PACIFIC NW LAB)
ASSOC WESTERN UNIVERSITY
Naval Research Laboratory

Single-crystal epitaxial thin films of gamma-Fe2O3(001) have been grown on MgO(001) using oxygen-plasma-assisted molecular beam epitaxy. the structure and magnetic properties of these filsm have been characterizec by a variety of techniques, including reflection high-energy electron diffraction (RHEED), low-energy electron diffraction (LEED), x-ray photoelectron spectroscopy and x-ray photoelectron/Auger electron diffraction (XPD/AED), vibrating sample magnetometry, and ferromagnetic resonance. Real-time RHEED reveals that the film growth occurs in a layer-by-layer fashion. The gamma-Fe2O3(001) film surface exhibits a (1x1) LEED pattern. The growth of gamma-Fe2O3 films at 450 degrees C is accompanied by sigificant MG outdiffusion. AED of Mg KLL Auger emission reveals that Mg substitutionally incorporates in the gamma-Fe2O3 lattice, occupying the octahedral sites. Magnetic moments are ~ 2300 G and ~4500 G for gamma-Fe2O3 films grown at 250 degrees C and 450 degrees C, respectively. The high magnetic moment for the films grown at 450 degrees C could be attributed to the high degree of structural order of the films and Mg substitution at octahedral sites.

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1557651

Report Number(s):: PNNL-SA-28077

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 7 Vol. 81

Country of Publication:: United States

Language:: English

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Oxide
Iron
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magnetic properties
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