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Millimicrosecond Magnetization Reversal in Thin Magnetic Films

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2 Author(s)

From ferromagnetic resonance experiments and from calculations based on the modified Landau-Lifschitz equation, switching times for the coherent rotation of the magnetization in thin, permalloy-type films have been predicted to lie in the range of 1 mi1limicrosecond.1 First measurements by D.O. Smith et al,2 utilizing a travelling-wave oscilloscope with a response time of 2 mµsec, indicated switching times of about 3 mµsec. In this communication, first results of advanced millimicrosecond measurements are reported. These were obtained by using special pulse equipment including a sampling oscilloscope,3,4 with an over-all response time of about 0.5 mµsec. Flux changes as fast as 1.5 mµsec could be observed, for not only the longitudinal flux component,5 but also, for the first time, the transverse one.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:3 ,  Issue: 4 )

Date of Publication:

Oct. 1959

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