General features of photoinduced spin dynamics in ferromagnetic and ferrimagnetic compounds

T. Ogasawara, K. Ohgushi, Y. Tomioka, K. S. Takahashi, H. Okamoto, M. Kawasaki, Y. Tokura

Research output: Contribution to journalArticlepeer-review

100 Citations (Scopus)

Abstract

Ultrafast photoinduced spin dynamics has been investigated by time-resolved magneto-optical Kerr spectroscopy for various ferromagnetic and ferrimagnetic compounds: FeCr2S4, CoCr2S4, CuCr2Se4, CdCr2Se4, La 0.6Sr0.4MnO3, and SrRuO3. The temporal demagnetization process, which is observed commonly for all the compounds, essentially consists of two components: One is an instantaneous change which originates perhaps from multiple emissions of magnetic excitations during nonradiative decay of photoexcited carriers, and the other is a delayed response due to thermalization of the spin system. The time constant of the delayed change depends strongly on materials and is scaled with the magnetocrystalline anisotropy, indicating that spin-orbit coupling is a dominant interaction for this process.

Original languageEnglish
Article number087202
JournalPhysical review letters
Volume94
Issue number8
DOIs
Publication statusPublished - 2005 Mar 4
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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