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Open Access Publications from the University of California

Electric current induced ultrafast demagnetization

  • Author(s): Wilson, RB
  • Yang, Y
  • Gorchon, J
  • Lambert, CH
  • Salahuddin, S
  • Bokor, J
  • et al.

© 2017 American Physical Society. We report the magnetic response of Co/Pt multilayers to picosecond electrical heating. Using photoconductive Auston switches, we generate electrical pulses with 5.5 ps duration and hundreds of pico-Joules to pass through Co/Pt multilayers. The electrical pulse heats the electrons in the Co/Pt multilayers and causes an ultrafast reduction in the magnetic moment. A comparison between optical and electrically induced demagnetization of the Co/Pt multilayers reveals significantly different dynamics for optical vs electrical heating. We attribute the disparate dynamics to the dependence of the electron-phonon interaction on the average energy and the total number of initially excited electrons.

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