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Propagation and control of nano-scale, magnetic droplet solitons



Thomas J. Silva, Mark Hoefer, Matteo Sommacal


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 negative magnetic field gradient, the sustenance of a stationary droplet 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.
Physical Review Letters


soliton, droplet, spin torque, nanocontact


Silva, T. , Hoefer, M. and Sommacal, M. (2012), Propagation and control of nano-scale, magnetic droplet solitons, Physical Review Letters, [online], (Accessed June 20, 2024)


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Created June 11, 2012, Updated November 10, 2018