Xiaobin Zhu, Zhigang Liu, V. Metlushko, M. R. Freeman
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引用次数: 0
Abstract
Spin dynamics of magnetic disks in the vortex state is studied by ultrafast optics. In patterned Co disks, we found that time-domain spin dynamics are strongly dictated by the transient field direction. For transient field directions applied parallel to the disk plane, an azimuthal spin-wave mode splitting of Co disks of greater than 2 GHz arises on account of the presence of the vortex core. In the NiFe/Cu/Co disks, even though the laser beam only probes the top NiFe disks, we observe that there exists a dominant high frequency resonance close to that of Co disks. This is due to the dynamic dipolar interaction between the Co and NiFe layers. Spin dynamics in a large array of NiFe disks also has been studied through examination of the time-resolved magneto-optical Kerr effect at diffraction spots.
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