Photoinduced spin dynamics in La0.6Sr0.4MnO3 observed by time-resolved magneto-optical Kerr spectroscopy

T. Ogasawara, Y. Tomioka, H. Okamoto, Y. Tokura, M. Matsubara, M. Kuwata-Gonokami

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

Photoinduced effect in a ferromagnetic perovskite La0.6Sr0.4MnO3 was investigated by femtosecond pump-probe spectroscopy. By utilizing magneto-optical Kerr rotation as a probe, the photoinduced dynamics of the spins was observed independently of the quasiparticle relaxation dynamics. The low-energy optical conductivity decreases immediately after photoexcitation without changing magnetization, and subsequently the demagnetization occurs in a strongly temperature-dependent manner. The photoinduced demagnetization shows critical slowing down with the time constant up to 1.4 ns when the spin temperature after photoexcitation reaches near the Curie temperature. Such a slow response of a spin system indicates good thermal insulation between quasiparticles and a spin system, suggesting small spin-orbit interaction.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume68
Issue number18
DOIs
Publication statusPublished - 2003 Nov 25
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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