New magnetic states in nanorings created by anisotropy gradients

•Description of magnetization properties of nanorings with anisotropy gradients.•New magnetic states appearing in magnetic nanorings.•Obtention of diagram state in function of the anisotropy.•New obtained states must be important for technological applications. The magnetic energy of nanorings with...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2019-08, Vol.484 (C), p.55-60
Main Authors: Castro, Mario A., Espejo, Álvaro P., Vargas, Nicolas M., Altbir, Dora, Allende, Sebastian, Carvalho-Santos, Vagson L.
Format: Article
Language:English
Subjects:
Anisotropy
Configurations
Magnetic domains
Magnetization
Materials Science
Nanorings
Phase diagrams
Physics
Variable anisotropy
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Summary:•Description of magnetization properties of nanorings with anisotropy gradients.•New magnetic states appearing in magnetic nanorings.•Obtention of diagram state in function of the anisotropy.•New obtained states must be important for technological applications. The magnetic energy of nanorings with variable anisotropy along their radius have been studied using analytical calculations and micromagnetic simulations. Based on the geometric characteristics of nanorings, four magnetic states are considered, looking to the relatively lower energy magnetization configuration as a function of anisotropy and geometry. Analytical phase diagrams with these states are presented showing that changes in the anisotropy yield the appearance of new magnetic states, here called meron and knot-like states, appear. Nevertheless, micromagnetic simulations evidence that the knot-like state can be interpreted as a vortex configuration with a magnetization that rotates around the border of the ring. The possibility of obtaining new magnetic states is interesting as from fundamental as from applied viewpoint.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2019.03.118