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A model for structural defects in nanomagnets
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View: Figures


Image of FIG. 1.
FIG. 1.

Illustration of how the defect-vortex interaction takes place: weak at the core borders, where exchange energy is small, rising to its maximum at the vortex center, where exchange density gets its highest value. Its effective range is around 10 nm, in accordance with recent experiments; its (Gaussian) shape may be controlled by varying -parameter (we have taken in order to set the interaction range , according to experiments).

Image of FIG. 2.
FIG. 2.

How the vortex equilibrium position vs external field is modified by virtue of the interaction with structural defects (if the sample were pure, a straight line would be the case). A comparison with experimental findings, as reported in Ref. 20, shows a good qualitative agreement. Namely, note the interaction with pinning and repulsive defects, indicated by blue and black arrows, respectively. (Typical values used for read in the range . Note that such values are much smaller than , the elementary exchange area, showing the smallness of our described defects, as initially supposed).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A model for structural defects in nanomagnets