[SLAC] [SLAC Pubs and Reports]

SLAC-PUB-7871
Magnetization Reversal in Ultra Short Magnetic Field Pulses

Abstract

Strong in-plane magnetic field pulses of 2 - 4.4 ps duration have been used to study magnetization reversal in perpendicularly magnetized Co/Pt multi-layer films. Characteristic ring domains, reminiscent of the field contour during exposure are observed later with high resolution Kerr microscopy. Their radii represent switching fields which are in quantitative agreement with the well known coherent rotation model. The additional observation of intrinsic transition broadening is attributed to the existence of static and dynamic fluctuations of the magnetic anisotropy.

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