Millimicrosecond Magnetization Reversal in Thin Magnetic Films

A special pulse equipment including a pulse sampling oscilloscope with an overall response time of 0.35 mμsec for the observation of the millimicrosecond flux reversal in thin permalloy films is described. Output signals as short as 1 mμsec have been obtained and are discussed with respect to the underlying reversal processes. Inverse switching times versus driving field curves have slopes of about ${10}^8/\mathrm{oe}\hspace{0.17em}\sec$ . Coherent rotation and oscillation of the magnetization have been clearly detected by picking up the flux change transverse to the driving field.