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Polarization selective magnetic vortex dynamics and core reversal in rotating magnetic fields
Michael Curcic1, Bartel Van Waeyenberge, Arne Vansteenkiste
1Max-Planck-Institut für Metallforschung, 70569 Stuttgart, Germany. curcic@mf.mpg.de
Physical Review Letters
|December 31, 2008
Summary
Rotating magnetic fields can selectively control magnetic vortex dynamics in submicron platelets. This method allows for precise manipulation of vortex core polarization states, unlike linear fields or spin currents.
Area of Science:
- Spintronics
- Condensed Matter Physics
- Materials Science
Background:
- Magnetic vortices are fundamental spin structures in soft magnetic materials.
- Controlling vortex core polarization is crucial for developing advanced magnetic devices.
- Previous methods using linear fields or spin currents excite multiple polarization states.
Purpose of the Study:
- To investigate the selective excitation of magnetic vortex core polarization states.
- To explore the dynamics of magnetic vortices under in-plane rotating magnetic fields.
- To demonstrate a method for controlled reversal of vortex polarization.
Main Methods:
- Utilizing submicron magnetic platelets.
- Applying in-plane rotating magnetic fields.
- Direct imaging with time-resolved scanning X-ray microscopy.
Main Results:
- An in-plane rotating magnetic field selectively excites one vortex core polarization state.
- Excitation of the gyrotropic mode depends on the field's rotation sense matching the vortex gyration sense.
- Selective reversal of vortex polarization was achieved using the rotating field.
Conclusions:
- In-plane rotating magnetic fields offer precise control over magnetic vortex dynamics.
- This selective excitation mechanism can be exploited for advanced spintronic applications.
- The findings provide a new pathway for manipulating magnetic information storage.
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