Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New magnetic states in nanorings created by anisotropy gradients   Magnetic nanorings have been widely studied due to their potential
applications in spintronic and magnonic devices. In this work, by means of
analytical calculations and micromagnetic simulations we have analyzed the
magnetic energy of nanorings with variable anisotropy along their radius. Four
magnetic states, including two new magnetic configurations, here called meron
and knot-like states, are considered, looking to the relative lower energy
states as a function of anisotropy. Phase diagrams with this states are
presented.

37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc