Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Propagation and control of nano-scale, magnetic droplet solitons   The propagation and controlled manipulation of strongly nonlinear,
two-dimensional solitonic states in a thin, anisotropic ferromagnet are
theoretically demonstrated. It has been recently proposed that spin-polarized
currents in a nanocontact device could be used to nucleate a stationary
dissipative droplet soliton. Here, an external magnetic field is introduced to
accelerate and control the propagation of the soliton in a lossy medium.
Soliton perturbation theory corroborated by two-dimensional micromagnetic
simulations predicts several intriguing physical effects, including the
acceleration of a stationary soliton by a magnetic field gradient, the
stabilization of a stationary droplet by a uniform control field in the absence
of spin torque, and the ability to control the soliton's speed by use of a
time-varying, spatially uniform external field. Soliton propagation distances
approach 10 $\mu$m in low loss media, suggesting that droplet solitons could be
viable information carriers in future spintronic applications, analogous to
optical solitons in fiber optic communications.

35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ