Exchange bias in polycrystalline magnetite films made by ion-beam assisted deposition

Kaur, Maninder; Jiang, Weilin; Qiang, You; Burks, Edward C.; Liu, Kai; Namavar, Fereydoon; McCloy, John S.

doi:10.1063/1.4900747

Title: Exchange bias in polycrystalline magnetite films made by ion-beam assisted deposition

Journal Article · Mon Nov 03 00:00:00 EST 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4900747· OSTI ID:1166845

Kaur, Maninder ^[1]; Jiang, Weilin ^[2]; Qiang, You ^[1]; Burks, Edward C. ^[3];

^[3]; Namavar, Fereydoon ^[4];

^[5]

Univ. of Idaho, Moscow, ID (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Univ. of California, Davis, CA (United States)
Univ. of Nebraska Medical Center, Omaha, NE (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Washington State Univ., Pullman, WA (United States)

Iron oxide films were deposited onto Si substrates using ion-beam-assisted deposition. The films were ~300 nm thick polycrystalline magnetite with an average crystallite size of ~6 nm. Additionally, incorporation of significant fractions of argon in the films from ion bombardment is evident from chemical analysis, and Fe/O ratios are lower than expected from pure magnetite. However, Raman spectroscopy and x-ray diffraction both indicate that the films are single-phase magnetite. Since no direct evidence of a second phase could be found, exchange bias likely arises due to defects at grain boundaries, possibly amorphous, creating frustrated spins. Since these samples have such small grains, a large fraction of the material consists of grain boundaries, where spins are highly disordered and reverse independently with external field. Furthermore, the high energy deposition process results in an oxygen-rich, argon-containing magnetite film with low temperature exchange bias due to defects at the high concentration of grain boundaries.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1166845

Alternate ID(s):: OSTI ID: 1420483

Report Number(s):: PNNL-SA-104251; 44713

Journal Information:: Journal of Applied Physics, Vol. 116, Issue 17; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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