M. A. Hoefer, M. Sommacal, T. J. Silva
The propagation and controlled manipulation of strongly nonlinear,
two-dimensional solitonic states in a thin, anisotropic ferromagnet is
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 damped 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 ten microns 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.
View original:
http://arxiv.org/abs/1202.3421
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