Non-linear radial spinwave modes in thin magnetic disks

Journal Article · Mon Jan 19 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4906196· OSTI ID:22415142

De Clercq, J.; Vansteenkiste, A.; Van Waeyenberge, B. ^[1]; Gangwar, A.; Back, C. H. ^[2]; Weigand, M. ^[3]

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1. Department Solid State Sciences, Ghent University, Krijgslaan 281/S1, 9000 Ghent (Belgium)
2. Department of Physics, Universität Regensburg, Universitätsstrasse 31, 93040 Regensburg (Germany)
3. Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569 Stuttgart (Germany)

We present an experimental investigation of radial spin-wave modes in magnetic nano-disks with a vortex ground state. The spin-wave amplitude was measured using a frequency-resolved magneto-optical spectrum analyzer, allowing for high-resolution resonance curves to be recorded. It was found that with increasing excitation amplitude up to about 10 mT, the lowest-order mode behaves strongly non-linearly as the mode frequency redshifts and the resonance peak strongly deforms. This behavior was quantitatively reproduced by micromagnetic simulations. Micromagnetic simulations showed that at higher excitation amplitudes, the spinwaves are transformed into a soliton by self-focusing, and collapse onto the vortex core, dispersing the energy in short-wavelength spinwaves. Additionally, this process can lead to switching of the vortex polarization through the injection of a Bloch point.

• OSTI ID: 22415142
• Journal Information: Applied Physics Letters, Vol. 106, Issue 3; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLITUDES
EXCITATION
MAGNETIC DISKS
NONLINEAR PROBLEMS
POLARIZATION
RESOLUTION
RESONANCE
SIMULATION
SOLITONS
SPIN WAVES