arXiv subjects

Smiljan Vojkovic

Publications and source records attributed to Smiljan Vojkovic.

2 recordsLinked to original sources

arXiv2017

Vortex-antivortex pairs induced by curvature in toroidal nanomagnets

We show that the curvature of nanomagnets can be used to induce chiral textures in the magnetization field. Among the phenomena related to the interplay between geometry and magnetic behavior at nanomagnets, an effective curvature-induced chiral interaction has been recently predicted. In this work, it is shown that a magnetization configuration consisting of two structures with opposite winding numbers (vortex and antivortex) appear as remanent states in hollow toroidal nanomagnets. It is shown that these topological configurations are a result of a chiral interaction induced by curvature. In this way, the obtained results present a new form to produce stable vortices and antivortices by using nanomagnets with variable curvature.

cond-mat.mes-hall↗

arXiv2016

Magnetization ground state and reversal modes of magnetic nanotori

In this work, and by means of micromagnetic simulations, we study the magnetic properties of toroidal nanomagnets. The magnetization ground state for different values of the aspect ratio between the toroidal and polar radii of the nanotorus has been obtained. The hysteresis curves are also obtained, evidencing the existence of two reversal modes depending on the geometry: a vortex mode and a coherent rotation. A comparison between toroidal and cylindrical nanoparticles has been performed evidencing that nanotori can accommodate a vortex as the ground state for smaller volume than cylindrical nanorings. This is important because if vortices are used as bits of information, nanotori allow a higher density data storage.

cond-mat.mes-hall↗