Abstract
Collective modes of the gyrotropic motion of a magnetic vortex core in ordered arrays of triangular and square ferromagnetic film nanodots have been theoretically investigated. The dispersion relations have been derived. The dipole–dipole interaction of the magnetic moments of the magnetic vortex cores of elements has been taken into account in the approximation of a small shift from the equilibrium position. It is shown that the effective rigidity of the magnetic subsystem of triangular elements is noticeably higher than that of the subsystem of square elements of the same linear sizes. The potential application of the polygonal film nanodisks as nanoscalpels for noninvasive tumor cell surgery is discussed
Highlights
Ordered arrays and suspensions of ferromagnetic nanodots have a great potential for application in new spintronic devices and noninvasive cell nanosurgery of malignant tumors in medicine [1, 2]
The requirements for the magnetic moment of a nanoobject used as a magneticfiled-driven nanoscalpel for cell destruction are contradictory: an increase in the magnetic moment facilitates the cell destruction, but is accompanied by an undesirable effect of agglomeration
To sum up the comparison of the properties of arrays of square and triangular elements, we can emphasize some circumstances that can play a significant role in selecting the objects that are candidates for use as functional tools for medicine or various spintronic devices
Summary
Ordered arrays and suspensions of ferromagnetic nanodots have a great potential for application in new spintronic devices and noninvasive cell nanosurgery of malignant tumors in medicine [1, 2]. It is assumed that the magnetization configuration in the region covered by the vortex distribution remains unchanged upon displacement of the core from the equilibrium position. Exit of the magnetic subsystem of elements from the metastable state (the shift of the core from the equilibrium position), the terms describing the pairing energy of interaction between the magnetic moments of different elements, and the terms describing external factors (fields). We consider specific equations for square and triangular elements using the models that are simple, but make it possible to compare the resonance behavior of disks with different shapes and the effective rigidity of their magnetic subsystems
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