The existence of the topological “breathing” mode driven by spin-tranfer torque found by means of micromagnetic simulations has been confirmed by analytical calculations based on the linearization of the equation of motion. As observed in the simulations, it has been assumed that the topological magnetic skyrmion distribution varies with time passing from a Bloch to a Nèel skyrmion and vice versa. The deviation of the magnetization from the equilibrium ground-state is written as a variational form depending on the derivatives with respect to the radial coordinate and the time. It is found that the angular frequency of the topological “breathing” mode can be expressed as a function of the effective field and of the polar angle of the topological skyrmion distribution for different intervals of time.
Topological skyrmion mode driven by spin transfer-torque - Presentazione poster - Conferenza internazionale
ZIVIERI, Roberto;
2014
Abstract
The existence of the topological “breathing” mode driven by spin-tranfer torque found by means of micromagnetic simulations has been confirmed by analytical calculations based on the linearization of the equation of motion. As observed in the simulations, it has been assumed that the topological magnetic skyrmion distribution varies with time passing from a Bloch to a Nèel skyrmion and vice versa. The deviation of the magnetization from the equilibrium ground-state is written as a variational form depending on the derivatives with respect to the radial coordinate and the time. It is found that the angular frequency of the topological “breathing” mode can be expressed as a function of the effective field and of the polar angle of the topological skyrmion distribution for different intervals of time.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
