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Experimental determination of the distribution of relaxation time for thermally activated transition in thin film magnetic recording media

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4 Author(s)
Yang, Cheng ; Department of Chemical Engineering and Materials Science, The Center for Micromagnetics and Information Technologies (MINT), University of Minnesota, Minneapolis, Minnesota 55455 ; Sivertsen, J.M. ; Li, Tan ; Judy, J.H.

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Although grain size distribution has significant effects on the time decay behavior of thin film magnetic recording media, the grains size itself is not a truly independent parameter due to intergranular exchange coupling. Relaxation time incorporates the interaction. Its distribution will determine the time decay performance of thin film magnetic recording media. An algorithm is proposed to determine the unique distribution of relaxation time in magnetic recording media directly from the experimental data without any presumption. It was found for the first time that the distribution of relaxation time is very well described by Weibull distribution. © 1999 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:85 ,  Issue: 8 )