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Transient enhancement of magnetization damping in CoFeB film via pulsed laser excitation

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Author(s)

  • Bo Liu
  • Xuezhong Ruan
  • Zhenyao Wu
  • Hongqing Tu
  • Jun Du
  • Jing Wu
  • Xianyang Lu
  • Liang He
  • Rong Zhang
  • Yongbing Xu

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Publication details

JournalApplied Physics Letters
DateAccepted/In press - 2 Jul 2016
DatePublished (current) - 25 Jul 2016
Issue number4
Volume109
Number of pages4
Original languageEnglish

Abstract

Laser-induced spin dynamics of in-plane magnetized CoFeB films has been studied by using time-resolved magneto-optical Kerr effect measurements. While the effective demagnetization field shows little dependence on the pump laser fluence, the intrinsic damping constant has been found to be increased from 0.008 to 0.076 with the increase in the pump fluence from 2 mJ/cm2 to 20 mJ/cm2. This sharp enhancement has been shown to be transient and ascribed to the heating effect induced by the pump laser excitation, as the damping constant is almost unchanged when the pump-probe measurements are performed at a fixed pump fluence of 5 mJ/cm2 after irradiation by high power pump pulses.

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