Magnetic force microscopy and simulated computation study of the shape defects-induced static magnetic structure in a single Ni80Fe20 nanowire

The static magnetic structure of a single shape-defective Ni80Fe20 nanowire has been investigated by magnetic force microscopy (MFM). The result shows that defects of the shape of the nanowire have an effect on the magnetic state of the nanowire. In order to check the influence of defects of the shape on the magnetic state, a micromagnetic simulation and a MFM image simulated computation are introduced. Two model systems are studied: (I) model I: no defects of the shape is present and (II) model II: the defects of the shape are introduced into the ends of the nanowire. The simulated computation result of model II is in good agreement with experimental results for the single Ni80Fe20 nanowire. It may have important significance for guiding in sample preparation and application.