Magnetization Reversal Modes in Fe0.49Co0.41Ni0.10 Nanowire Arrays: Analytical Calculations and Experiments

The angular dependence of coercivity and squareness of Fe0.49Co0.41Ni0.10 nanowire arrays with variouslengths have been comparatively studied. Investigation results demonstrate that the easy axis is along the wire axis forFe0.49Co0.41Ni0.10 nanowire arrays with lengths ranging from 19 to 41 μm due to their large shape anisotropy. A nonmonotonicbehavior for the angular dependence of the coercivity occurs, revealing a transition between the vortex andtransverse reversal modes. The analytical calculations of Hc(θ) allow us to confirm that the magnetization reversal isascribed to the propagation of a transverse and vortex domain wall. Furthermore, we observed that the transition anglefrom the vortex to transverse reversal mode shifted toward lower angles as the length increased. These results can beattributed to an increase in the magnetostatic interaction with length.

Keywords:

FeCoNi nanowires , reversal modes , transverse domain wall , vortex domain wall