Magnetic moment investigations of epitaxial magnetite thin films

M. Kallmayer, K. Hild, H. J. Elmers, S. K. Arora, Han Chun Wu, R. G S Sofin, I. V. Shvets

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

In this report, we provide an x-ray magnetic circular dichroism (XMCD) study for 100 nm thick epitaxial magnetite (Fe3 O4) films on MgO (001) and Al2 O3 (0001) substrates. For XMCD, we recorded the surface sensitive total electron yield and the bulk sensitive transmission spectra. From the analysis of the XMCD data, we find an increased Fe spin moment (10% larger) at the surface of the film on MgO (100) with respect to the corresponding bulk value of the film. Surface and bulk spin moments of the film on Al2 O3 (0001) are almost equal. For both films, the bulk orbital to spin moments ratio increases from zero at 70 K to 0.03-0.04 at 300 K. For Fe3 O4 MgO (001), the surface orbital to spin moment ratio behaves similarly to the bulk value, while the orbital to spin moments ratio is increased at the Fe3 O4 Al2 O3 (0001) surface to 0.06. The observed differences between films grown on MgO and Al2 O3 are explained within the framework of differences in mismatch strain experienced by the films.

Original languageEnglish
Article number07D715
JournalJournal of Applied Physics
Volume103
Issue number7
DOIs
Publication statusPublished - 2008

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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    Kallmayer, M., Hild, K., Elmers, H. J., Arora, S. K., Wu, H. C., Sofin, R. G. S., & Shvets, I. V. (2008). Magnetic moment investigations of epitaxial magnetite thin films. Journal of Applied Physics, 103(7), [07D715]. https://doi.org/10.1063/1.2838982