Journal of Applied Physics -- September 1, 2000 -- Volume 88, Issue 5 pp. 3096-3098 

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Quantitative analysis on correlation between local coercivity and reversal time in ferromagnetic thin films

    Sug-Bong Choe and Sung-Chul Shin 
    Department of Physics and Center for Nanospinics of Spintronic Materials, Korea Advanced Institute of Science and Technology, Taejon 305-701, Korea 

(Received 28 January 2000; accepted 15 June 2000) 

We report a method to quantitatively analyze the correlation between the local coercivity variation and the local reversal-time distribution in
ferromagnetic thin films. The spatial distribution of the local coercivity on a film plane was directly measured from the hysteresis loops of
each local area of 320×320 nm2 and then, the local coercivity distribution was quantitatively correlated with the local reversal-time
distribution obtained from time-resolved domain evolution patterns grabbed at precisely the same position of the film. We demonstrate a
clear experimental evidence of the direct correlation between the real coercivity distribution and the magnetization reversal dynamics, which
could be explained within a context of a thermally activated relaxation process. ©2000 American Institute of Physics. 

PII: S0021-8979(00)07718-5 
DOI: 10.1063/1.1288777 
PACS: 75.70.Cn, 75.50.Cc, 75.60.Ej, 75.70.Kw