Exchange bias in polycrystalline magnetite films made by ion-beam assisted deposition
Abstract
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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1166845
- Alternate Identifier(s):
- OSTI ID: 1420483
- Report Number(s):
- PNNL-SA-104251
Journal ID: ISSN 0021-8979; 44713
- Grant/Contract Number:
- AC05-76RL01830
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 116; Journal Issue: 17; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; magnetite; IBAD; thin film; FORC; exchange bias; Environmental Molecular Sciences Laboratory
Citation Formats
Kaur, Maninder, Jiang, Weilin, Qiang, You, Burks, Edward C., Liu, Kai, Namavar, Fereydoon, and McCloy, John S. Exchange bias in polycrystalline magnetite films made by ion-beam assisted deposition. United States: N. p., 2014.
Web. doi:10.1063/1.4900747.
Kaur, Maninder, Jiang, Weilin, Qiang, You, Burks, Edward C., Liu, Kai, Namavar, Fereydoon, & McCloy, John S. Exchange bias in polycrystalline magnetite films made by ion-beam assisted deposition. United States. https://doi.org/10.1063/1.4900747
Kaur, Maninder, Jiang, Weilin, Qiang, You, Burks, Edward C., Liu, Kai, Namavar, Fereydoon, and McCloy, John S. 2014.
"Exchange bias in polycrystalline magnetite films made by ion-beam assisted deposition". United States. https://doi.org/10.1063/1.4900747. https://www.osti.gov/servlets/purl/1166845.
@article{osti_1166845,
title = {Exchange bias in polycrystalline magnetite films made by ion-beam assisted deposition},
author = {Kaur, Maninder and Jiang, Weilin and Qiang, You and Burks, Edward C. and Liu, Kai and Namavar, Fereydoon and McCloy, John S.},
abstractNote = {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.},
doi = {10.1063/1.4900747},
url = {https://www.osti.gov/biblio/1166845},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 17,
volume = 116,
place = {United States},
year = {Mon Nov 03 00:00:00 EST 2014},
month = {Mon Nov 03 00:00:00 EST 2014}
}
Web of Science
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