Abstract
Magnetization reversal of a 5 μm wide and 10 μm grating periodic stripe-patterned cobalt thin film is investigated by Kerr microscopy. The patterned substrate and the cobalt thin film are prepared by standard UV-lithography and electron beam evaporation respectively. It is observed that magnetization reversal process strongly depends on the interplay between random magneto-crystalline anisotropy and shape-induced uniform uni-axial anisotropy. Domain wall motion is observed along easy magnetization axes (along length of stripe) while inhomogeneous rotation i.e. incoherent rotation is observed along hard magnetization axes (perpendicular to length of stripe). The angular dependence of coercivity (HC) is fitted by a two-phase model of magnetization reversal, which is corroborated with the magnetic domain images.
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