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Determination of switching field distributions for perpendicular recording media

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3 Author(s)
R. J. M. van de Veerdonk ; Seagate Res., Pittsburgh, PA, USA ; Xiaowei Wu ; D. Weller

We present a novel experimental method to determine the switching field distribution in perpendicular thin-film magnetic recording media. The method assumes a constant demagnetization factor independent of the magnetic state during switching and a log-normal switching field distribution. The new technique allows a deconvolution of the effects of the switching field distribution and demagnetization, which is important for the development of low-noise perpendicular magnetic recording media. Results are discussed for a series of recoil loop measurements for a perpendicular CoCrPt alloy medium.

Published in:

IEEE Transactions on Magnetics  (Volume:39 ,  Issue: 1 )