SPRING 2013 SCHEDULE
Mark Hoefer (NC State Mathematics)
Magnetic Solitons, Theory and Realization
Fri., April 26, 3:30-4:30, Riddick 415 Conference Room
The concept of a soliton as a localized particle-like wave excitation that preserves its shape can be extended to systems that are far from thermodynamic equilibrium through the concept of a dissipative soliton, enabling the analysis of a broad range of physical, chemical, and biological nonlinear systems in which localized excitations are observed. The defining characteristic of a dissipative soliton is a delicate balance between nonlinearity and dispersion, as is the case for conservative solitons, with an additional balance between gain and loss. This talk will present a new manifestation of a dissipative soliton in the context of nanomagnetism. Experiment  and theory will be used to demonstrate the existence and properties of a localized oscillation mode called a magnetic droplet in a nanocontact based spin torque oscillator with perpendicular magnetic anisotropy. First predicted over 35 years ago , this is the first realization of a magnetic droplet soliton. Magnetic droplets are stable, controllable, strongly nonlinear, precessing dipoles exhibiting intriguing nonlinear physics.
 Spin Torque.Generated Magnetic Droplet Solitons, S. M. Mohseni, et al, Science, 339, 1295-1298 (2013).
 B. A. Ivanov, A. M. Kosevich, Zh. Eksp. Teor. Fiz. 72, 2000 (1977).