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Magnetization reversal in nanowires with a spiral shape
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10.1063/1.2948939
/content/aip/journal/jap/104/1/10.1063/1.2948939
http://aip.metastore.ingenta.com/content/aip/journal/jap/104/1/10.1063/1.2948939

Figures

Image of FIG. 1.
FIG. 1.

Scanning electron micrograph images of the three Fe spiral structures used in the experiments. The different spiral structures are labeled , , and . The arrows indicates the direction in which the external magnetic field was applied.

Image of FIG. 2.
FIG. 2.

Sketch of the vector MOKE configuration to measure the Kerr rotation of (a) the component and (b) the component . In both configurations longitudinal MOKE detects the Kerr rotation of the magnetization component, which lies in the plane of incidence, i.e., on the horizontal axis in this sketch. is the angle between the orientation of the sample and the external magnetic field, is the angle between the net magnetization vector and the magnetic field.

Image of FIG. 3.
FIG. 3.

Vector MOKE hysteresis loops of the (circles) and (squares) obtained at the specular reflection spot. Closed circles (squares) denote the ascending branch, open circles (squares) the descending branch of the hysteresis. It should be noted that the scale for the component is enlarged by a factor of 10.

Image of FIG. 4.
FIG. 4.

Left column: Plots of the vector MOKE hysteresis curves measured at the specular spot, and the first and second diffraction spots for the structure . Right column: Corresponding calculated hysteresis curves obtained from micromagnetic simulation. For clarity only the ascending branch of the hysteresis loops is shown.

Image of FIG. 5.
FIG. 5.

Calculated magnetization profiles of the structure at selected field values. Starting from saturation the magnetization configuration is seen to be divided by the horizontal axis in an upper and a lower part. The magnetization direction follows the curvature of the spiral on both sides of the horizontal line until they touch each other in the form of a head-to-head domain wall at the horizontal axis. The outer parts of the spiral reverse in an ascending field first, followed at higher fields by the inner parts of the spiral.

Image of FIG. 6.
FIG. 6.

Plots of the vector MOKE curves measured at the specular spot, and the first and second diffraction spots for structure (left column) and of the corresponding calculated curves obtained from micromagnetic simulation (right column). For clarity only the ascending branch of the hysteresis loops is shown.

Image of FIG. 7.
FIG. 7.

Calculated magnetization profiles of the structure at selected field values. The horizontal axis divides again the spirals in two half planes where the magnetization vector follows the curvature of the spiral, similar to . The outer parts are now allowed to interact via stray fields, which increases their coercive field to much higher values than the inner parts, in contrast to pattern .

Image of FIG. 8.
FIG. 8.

Plots of the vector MOKE curves measured at the specular spot, and the first and second diffraction spots for structure (left column) and of the corresponding calculated curves obtained from micromagnetic simulation (right column). For clarity only the ascending branch of the hysteresis loops is shown.

Image of FIG. 9.
FIG. 9.

Calculated magnetization profiles of the structure at selected field values. As the ends pieces of the spirals are connected and domains walls can propagate across the bridges, leading to a strong reduction of the coercivity.

Image of FIG. 10.
FIG. 10.

Ascending branches of the hysteresis loops of ideal spiral structures obtained from micromagnetic simulations. These spiral structures have the same dimensions as the real ones, but without kinks and with constant line width.

Image of FIG. 11.
FIG. 11.

Calculated time resolved snapshots of the change of the magnetization configuration inside structure when the external field is increased from 135 to 140 Oe. The arrows indicate the direction of the magnetization inside the domains.

Tables

Generic image for table
Table I.

Coercive field and normalized remanence values of the component hysteresis loops depicted in Fig. 3 for the three magnetic Fe spirals. The last column shows the coercive field values of the component hysteresis for ideal spiral structures obtained from micromagnetic simulations.

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/content/aip/journal/jap/104/1/10.1063/1.2948939
2008-07-08
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetization reversal in nanowires with a spiral shape
http://aip.metastore.ingenta.com/content/aip/journal/jap/104/1/10.1063/1.2948939
10.1063/1.2948939
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