Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2012-02-25
AIP Advances 2, 012136 (2012); http://dx.doi.org/10.1063/1.3685590 (6 pages)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
10.1063/1.3685590
We study permalloy nanorings that are lithographically fabricated with narrow gaps that break the rotational symmetry of the ring while retaining the vortex ground state, using both micromagnetic simulations and magnetic force microscopy (MFM). The vortex chirality in these structures can be readily set with an in-plane magnetic field and easily probed by MFM due to the field associated with the gap, suggesting such rings for possible applications in storage technologies. We find that the gapped ring edge characteristics (i.e., edge profile and gap shape) are critical in determining the magnetization switching field, thus elucidating an essential parameter in the controls of devices that might incorporate such structures.
Bartell Jason
Crespi Vincent H.
Grigas Chris
Li Jie
Misra Rajiv
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