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We investigate the domain wall (DW) pinning and depinning processes at notches of ferromagnetic nanowires by means of micromagnetic calculation. Two distinct pinning mechanisms are examined-the kinetic pinning for a moving DW to be trapped at a notch and the static depinning for a trapped DW to move from the notch. Interestingly, the kinetic pinning field is revealed to be noticeably smaller than...
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