Abstract:
The magnetization reversal of local regions of CoFeB layers in a CoFeB/Ta/CoFeB heterostructure consisting of two ferromagnetic layers separated by a non-magnetic material under the action of a single ferromagnetic nanoparticle on its surface was studied by micromagnetic modeling. The modeling results demonstrate many unusual states with non-uniform magnetization distribution in ferromagnetic films. This is of interest for accurate measurements of the concentration of nanoparticles or magnetically labeled objects deposited on the surface of ferromagnetic sensors based on heterostructures with giant magnetoresistance.
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