Broadband spin dynamics of the magnetic vortex state: Effect of the pulsed field direction

Xiaobin Zhu, Zhigang Liu, Vitali Metlushko, Peter Grütter, Mark R. Freeman
2005 Physical Review B  
The dynamic spin modes observed in magnetic vortex structures are shown to depend strongly on the nature of the initial excitation by a transient pulse field. In submicrometer-sized Permalloy disks, when a uniform perpendicular transient field is used to perturb the magnetization, radial standing-wave modes are excited; whereas if an in-plane transient field is used, angular or azimuthal modes are formed. The existence of the vortex core is responsible for a frequency splitting of the azimuthal
more » ... modes, as demonstrated through comparison to micromagnetic simulations of a ring geometry.
doi:10.1103/physrevb.71.180408 fatcat:5qpgc3ad4begdcn3tvjyx5n2gi