Ultrafast demagnetization for Ni80Fe20 and half-metallic Co2MnSi Heusler alloy films

S. Mizukami, S. Tsunegi, T. Kubota, M. Oogane, D. Watanabe, H. Naganuma, Y. Ando, T. Miyazaki

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)

Abstract

We investigated ultrafast demagnetization for NM/Ni80Fe 20 (Py)/NM (NM=Ta,Pt) and epitaxial half-metallic Co2MnSi (CMS) films using an all-optical pump-probe technique to clarify the correlation between demagnetization time τM and magnetic damping constant α or spin polarization. The signal from the all-optical time-resolved magneto-optical Kerr effect exhibited rapid decrease in the sub-ps time regime and damped oscillations for these films. Values of τM and α were evaluated using the three- temperature model and the Landau-Lifshitz- Gilbert equation. The α values for the NM/Py/NM films depended on both the Py thickness and NM materials while τM was almost constant. The τM values for the epitaxial CMS films were almost independent of L21-ordering and a little shorter than those for NM/Py/NM films.

Original languageEnglish
Article number042017
JournalJournal of Physics: Conference Series
Volume200
Issue numberSECTION 4
DOIs
Publication statusPublished - 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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