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Title of article :
Domain reversal behavior in perpendicular magnetic nanothin films
Author/Authors :
Choe، نويسنده , , Sug-Bong and Shin، نويسنده , , Sung-Chul، نويسنده ,
Issue Information :
دوماهنامه با شماره پیاپی سال 2002
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Abstract :
We report domain reversal behavior in perpendicular ferromagnetic nanothin films investigated by means of a novel magneto-optical microscope magnetometer, capable of grabbing domain reversal patterns in real time under an applied field as well as simultaneous measurements of 8000 local hysteresis loops with 400-nm special resolution. Three contrasting domain reversal behaviors are found to exist: wall-motion dominant, dendritic-growth dominant, and nucleation dominant reversal. Quantitative analysis reveals that the contrasting reversal behavior is mainly caused by a sensitive change in wall-motion speed and that the reversal ratio of wall-motion speed over nucleation rate is a governing parameter for the contrasting domain reversal dynamics. The activation volumes of the wall-motion and nucleation processes are found generally unequal, and the inequality is closely related with the domain dynamics. The domain reversal pattern is truly coincident with submicron-scale local coercivity variation and local switching time of domain evolution is exponentially dependent on local coercivity governed by a thermal activation relaxation process. The observed domain reversal behavior could be well predicted by a Monte Carlo simulation of a micromagnetic model based on the uniaxial magnetic anisotropy of nanothin films.
Keywords :
Local magnetic properties , Magnetic microscope , Activation volume , Co/Pd multilayer , domain dynamics
Journal title :
Current Applied Physics
Journal title :
Current Applied Physics
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