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Periodic magnetic domain wall pinning in an ultrathin film with perpendicular anisotropy generated by the stray magnetic field of a ferromagnetic nanodot array
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10.1063/1.3105988
/content/aip/journal/apl/94/13/10.1063/1.3105988
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/13/10.1063/1.3105988
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Figures

Image of FIG. 1.
FIG. 1.

Cross-section of the perpendicular component of the stray field beneath (a) two negatively magnetized (AP) and (b) two positively magnetized (P) nanodots as calculated in the center of the continuous layer using . Pinning will occur wherever the stray field is negative (black) since it will oppose the positive applied field. For P alignment, each dot is surrounded by a negative stray field.

Image of FIG. 2.
FIG. 2.

PMOKE images of domain structures following field-driven expansion of positively magnetized (black) domains in the continuous layer. The white scale bars are long. These are “difference” images, in which an image of the sample with the continuous layer negatively saturated is subtracted from an image of the sample following field-driven domain wall propagation [step (iv) in the experimental method]. Each image has been extracted from larger original images. These were obtained either in “region 1,” located outside the arrays where there are no nanodots, (a)–(e), or “region 2,” located below a single wide nanodot array, (f)–(o). Measurements in region 2 were carried out for both parallel (P) and antiparallel (AP) alignment of the magnetization of the dots and the applied field, (f)–(j) and (k)–(o), respectively. Region 1 was a region of the continuous layer located approximately from the studied nanodot array. The nanodots appear as white points superimposed on the black domains. In (j) and (o) the nanodots are visible even outside the black domains due to a slight mechanical drift during the experiment.

Image of FIG. 3.
FIG. 3.

Domain wall velocities in the continuous layer outside the nanodot array (“no dots”) and beneath a single nanodot array for P and AP alignment of and . The gray line is a linear fit to the velocity data obtained outside the nanodot arrays. Velocity and field error bars are shown. The inset shows the same data plotted against with outside the array, and .

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/content/aip/journal/apl/94/13/10.1063/1.3105988
2009-04-02
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Periodic magnetic domain wall pinning in an ultrathin film with perpendicular anisotropy generated by the stray magnetic field of a ferromagnetic nanodot array
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/13/10.1063/1.3105988
10.1063/1.3105988
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