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arXiv · 1609.00758

Electric Current Induced Ultrafast Demagnetization

R. B. Wilson·Yang Yang·Jon Gorchon·Charles-Henri Lambert·Sayeef Salahuddin·Jeffrey Bokor
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Abstract

We report the magnetic response of Co/Pt multilayers to picosecond electrical heating. Using photoconductive Auston switches, we generate electrical pulses with 5.5 picosecond 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 total number of initially excited electrons.

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R. B. Wilson, Yang Yang, Jon Gorchon, Charles-Henri Lambert, Sayeef Salahuddin, Jeffrey Bokor. 2016-09-02. Electric Current Induced Ultrafast Demagnetization. https://doi.org/10.1103/physrevb.96.045105

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