Coupled Vortex Oscillations in Spatially Separated Permalloy Squares

Journal Article · Fri Apr 01 00:00:00 EDT 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.106.137201· OSTI ID:21550264

Vogel, Andreas; Kamionka, Thomas; Martens, Michael; Meier, Guido ^[1]; Drews, Andre ^[1]; Chou, Kang Wei; Tyliszczak, Tolek ^[2]; Stoll, Hermann ^[3]; Van Waeyenberge, Bartel ^[4]

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1. Institut fuer Angewandte Physik und Zentrum fuer Mikrostrukturforschung, Universitaet Hamburg, 20355 Hamburg (Germany)
2. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, 94720 California (United States)
3. Max-Planck-Institut fuer Metallforschung, 70569 Stuttgart (Germany)
4. Department of Solid State Sciences, Ghent University, 9000 Ghent (Belgium)

We experimentally study the magnetization dynamics of pairs of micron-sized permalloy squares coupled via their stray fields. The trajectories of the vortex cores in the Landau-domain patterns of the squares are mapped in real space using time-resolved scanning transmission x-ray microscopy. After excitation of one of the vortex cores with a short magnetic-field pulse, the system behaves like coupled harmonic oscillators. The coupling strength depends on the separation between the squares and the configuration of the vortex-core polarizations. Considering the excitation via a rotating in-plane magnetic field, it can be understood that only a weak response of the second vortex core is observed for equal core polarizations.

• OSTI ID: 21550264
• Journal Information: Physical Review Letters, Vol. 106, Issue 13; Other Information: DOI: 10.1103/PhysRevLett.106.137201; (c) 2011 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COUPLING
EXCITATION
HARMONIC OSCILLATORS
MAGNETIC FIELDS
MAGNETIZATION
MICROSCOPY
OSCILLATIONS
PERMALLOY
POLARIZATION
PULSES
TIME RESOLUTION
TRAJECTORIES
TRANSMISSION
VORTICES
X RADIATION
ALLOYS
ELECTROMAGNETIC RADIATION
ENERGY-LEVEL TRANSITIONS
IONIZING RADIATIONS
IRON ALLOYS
NICKEL ALLOYS
RADIATIONS
RESOLUTION
TIMING PROPERTIES
TRANSITION ELEMENT ALLOYS