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

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

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number173902
JournalJournal of Applied Physics
Volume116
Issue number17
DOIs
StatePublished - Nov 7 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Kaur, M., Jiang, W., Qiang, Y., Burks, E. C., Liu, K., Namavar, F., & McCloy, J. S. (2014). Exchange bias in polycrystalline magnetite films made by ion-beam assisted deposition. Journal of Applied Physics, 116(17), [173902]. https://doi.org/10.1063/1.4900747