Exchange bias in polycrystalline magnetite films made by ion-beam assisted deposition
- Department of Physics, University of Idaho, Moscow, Idaho 83844 (United States)
- Pacific Northwest National Laboratory, Richland, Washington 99352 (United States)
- Department of Physics, University of California, Davis, California 95616 (United States)
- University of Nebraska Medical Center, Omaha, Nebraska 68198 (United States)
Iron oxide films were produced using ion-beam-assisted deposition, and Raman spectroscopy and x-ray diffraction indicate single-phase magnetite. However, 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, suggesting greater than normal disorder. Low temperature magnetometry and first-order reversal curve measurements show strong exchange bias, which likely arises from defects at grain boundaries, possibly amorphous, creating frustrated spins. Since these samples contain grains ∼6 nm, a large fraction of the material consists of grain boundaries, where spins are highly disordered and reverse independently with external field.
- OSTI ID:
- 22308208
- Journal Information:
- Journal of Applied Physics, Vol. 116, Issue 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Microstructure, magnetic properties and the giant magnetoimpedance effect of amorphous CoSiB thin films deposited by different preparation methods
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journal | October 2018 |
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