Ultrafast magnetization dynamics in Co-based Heusler compounds with tuned chemical ordering

D. Steil, O. Schmitt, R. Fetzer, T. Kubota, H. Naganuma, M. Oogane, Y. Ando, A. K Suszka, O. Idigoras, G. Wolf, B. Hillebrands, A. Berger, M. Aeschlimann, M. Cinchetti

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10 Citations (Scopus)

Abstract

We have studied thin film samples of Co2FeSi and Co 2MnSi with different degrees of chemical ordering using the time-resolved magneto-optical Kerr effect to elucidate the influence of defects in the crystal structure on magnetization dynamics. Surprisingly, we find that the presence of defects does not influence the optically induced magnetization dynamics on the ultrashort timescale (some 100 fs). However, we observe a second demagnetization stage with a timescale of tens of picoseconds in Co 2MnSi for low chemical ordering; that is, a large number of defects. We interpret this second demagnetization step as originating from scattering of mostly thermalized majority electrons into unoccupied minority defect states.

Original languageEnglish
Article number063068
JournalNew Journal of Physics
Volume16
DOIs
Publication statusPublished - 2014 Jun

Keywords

  • Heusler compounds
  • halfmetallic materials
  • magnetic properties
  • spin dynamics
  • ultrafast demagnetization

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Steil, D., Schmitt, O., Fetzer, R., Kubota, T., Naganuma, H., Oogane, M., Ando, Y., K Suszka, A., Idigoras, O., Wolf, G., Hillebrands, B., Berger, A., Aeschlimann, M., & Cinchetti, M. (2014). Ultrafast magnetization dynamics in Co-based Heusler compounds with tuned chemical ordering. New Journal of Physics, 16, [063068]. https://doi.org/10.1088/1367-2630/16/6/063068