Resonant pinning spectroscopy with spin-vortex pairs

Abstract

Vortex pairs in magnetic nanopillars with strongly coupled cores and pinning of one of the cores by a morphological defect, are used to perform resonant pinning spectroscopy, in which a microwave excitation applied to the nanopillar produces pinning or depinning of the cores only when the excitation is in resonance with the rotational or gyrational eigenmodes of the specific initial state of the core-core pair. The shift in the eigenmode frequencies between the pinned and depinned states is determined experimentally and explained theoretically, and illustrates the potential for multi-core spin-vortex memory with resonant writing of information on to various stable vortex pair states. Further, it is shown how the same resonant spectroscopy techniques applied to a vortex pair can be used as a sensitive nanoscale probe for characterizing morphological defects in magnetic films.

8 pages, 5 figures

References in corpus (7)

• Current-driven resonant excitation of magnetic vortex
• A Frequency-Controlled Magnetic Vortex Memory
• Time-Resolved X-ray Microscopy of Spin-Torque-Induced Magnetic Vortex Gyration
• Dynamics of Pinned Magnetic Vortices
• Collective modes for an array of magnetic dots in the vortex state
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Cited by in corpus (2)

• Transient dynamics of strongly coupled spin vortex pairs: effects of anharmonicity and resonant excitation on inertial switching
• Effects of asymmetry in strongly coupled spin vortex pairs