A voltage pulse generator for magnetic field application was built using a coaxial cable as a capacitor. The pulse duration was fixed to 10ns and the pulse field rise time was controlled from 70ps to 4ns using a low pass filters. Magnetization switching experiments have been carried out on a Co/Pt multilayer dot with diameter of 300nm using perpendicular pulse fields. The required pulse field amplitude for magnetization switching is independent of the pulse rise time suggesting the thermally activated process is dominant in the perpendicular field geometry.
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