Stochastic phase synchronization and spin-wave propagation in non-equilibrium spin systems
by
Simone Borlenghi(KTH)
→
Europe/Stockholm
122:026
122:026
Description
In this talk I will present recent theoretical results concerning the propagation of spin waves (SW) (or magnons, coherent magnetic excitations) in magnetic systems driven out of equilibrium by a thermal gradient. Controlling the direction and the intensity of the gradient permits to synchronize and de-synchronize the SW frequencies of different subparts of the system. This phenomenon, which essentially consists in the stochastic (or noise induced) phase synchronization of the precessing spins, can be used to operate a new kind of SW diode and to localize SWs in a subpart of the system. From the theoretical point of view, the SW propagation can be described using the formalism of the non-equilibrium discrete nonlinear Schrödinger equation. Possible application to the propagation of magnon Bose-Einstein condensates will be also discussed.
Useful references:
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.047203 http://journals.aps.org/prb/abstract/10.1103/PhysRevB.89.054428 http://iopscience.iop.org/1742-5468/2013/08/P08017
