Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Skyrmion Based Spin-Torque Nano-Oscillator   Using micromagnetic simulation, we investigate the self-sustained oscillation
of magnetic skyrmion in a ferromagnetic circular nanodot, driven by spin-torque
which is generated from a reference layer of a circular nanopillar device. We
demonstrate, by lowering the value of uniaxial anisotropy constant ($K_u$), the
velocity of the skyrmion can be increased and using this property, gyration
frequency of the skyrmion oscillator can be enhanced. Annihilation of the
skyrmion at higher current densities, limit the gyration frequency of the
oscillator, whereas by modifying the $K_u$ value at the edge of nanodot, we are
able to protect the skyrmion from being annihilated at higher current densities
which in turn, increases the gyration frequency of the skyrmion based
oscillator. By linear fitting the velocity value, obtained from the motion of
the skyrmion in a nanostrip, we also predict the gyration frequency of the
skyrmion in the nanodot which proves the validity of our idea in an intuitive
way. We have also varied the radius of the nanodisk to see its effect on
skyrmion.

34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con