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Dimensionality effects on the magnetization reversal in narrow FePt nanowires

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8 Author(s)
Nguyen, V.D. ; INAC/CEA Grenoble, 17 avenue des Martyrs, 38054 Grenoble, France ; Vila, L. ; Marty, A. ; Pillet, J.C.
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The magnetization reversal of 10 nm thick FePt nanowires has been studied for widths down to 30 nm. Above 500 nm, the magnetic domains grow within a dendritic structure. Below 300 nm, the reversal takes place by propagation of a single domain wall (DW), and the coercivity increases. Below 50 nm, the coercivity increase is such that a mix of nucleation and DW propagation appears. These results suggest that the reversal process is determined by the comparison of the wire dimensions with four characteristic lengths: the dendrite width, the disorder length, the mean edge roughness, and the nucleation distance.

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Applied Physics Letters  (Volume:100 ,  Issue: 25 )