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

研究成果: Article査読

11 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号063068
ジャーナルNew Journal of Physics
16
DOI
出版ステータスPublished - 2014 6

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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