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Field- and current-induced domain-wall motion in permalloy nanowires with magnetic soft spots
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View: Figures


Image of FIG. 1.
FIG. 1.

Micromagnetic simulation of the position-dependent total energy (solid line) for a (a) transverse and (b) vortex wall in a nanowire. The soft magnetic region is marked by the light-colored shadow. The dashed line (left axis) represents the demagnetization energy and the dotted line (right axis) represents the exchange energy . Insets show the DW structure in the corresponding regions. The position of the DW is given in units of the size of the soft spot. Energy values are normalized to . [(c)–(e)] Successive differential x-ray micrographs of the magnetization configuration under application of a magnetic field aligned parallel to the nanowire. Arrows indicate the magnetization direction.

Image of FIG. 2.
FIG. 2.

Scanning-electron micrograph of a 400 nm wide permalloy nanowire with gold contacts L1 and L2. The position of the magnetic soft spot is marked by a light-colored shadow. The current pulse and the field angle are indicated.

Image of FIG. 3.
FIG. 3.

Dependence of the resistance of a nanowire between the contacts L1 and L2 on a magnetic field in direction. The arrow indicates the sweep direction of the magnetic field. [(a)–(c)] Tail-to-tail or [(d)–(f)] head-to-head DWs have been prepared in the curvature of the wire prior to the field sweep.

Image of FIG. 4.
FIG. 4.

Depinning probability of a tail-to-tail DW for different amplitudes of a 10 ns current pulse and different magnetic background fields (11 070 measurements).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Field- and current-induced domain-wall motion in permalloy nanowires with magnetic soft spots