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Time-resolved imaging of magnetic vortex dynamics using holography with extended reference autocorrelation by linear differential operator

DOI: 10.1038/srep36307 DOI Help

Authors: Nicholas Bukin (University of Exeter) , C. Mckeever (School of Physics and Astronomy, University of Exeter) , Erick Burgos-parra (University of Exeter) , P. S. Keatley (University of Exeter) , R. J. Hicken (University of Exeter) , F. Y. Ogrin (University of Exeter) , G. Beutier (CNRS, SIMAP) , M. Dupraz (Paul Scherrer Institute) , H. Popescu (SOLEIL Synchrotron) , N. Jaouen (SOLEIL Synchrotron) , F. Yakhou-harris (ESRF) , Stuart Cavill (University of York) , G. Van Der Laan (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Scientific Reports , VOL 6 , PAGES 36307

State: Published (Approved)
Published: October 2016

Open Access Open Access

Abstract: The magnetisation dynamics of the vortex core and Landau pattern of magnetic thin-film elements has been studied using holography with extended reference autocorrelation by linear differential operator (HERALDO). Here we present the first time-resolved x-ray measurements using this technique and investigate the structure and dynamics of the domain walls after excitation with nanosecond pulsed magnetic fields. It is shown that the average magnetisation of the domain walls has a perpendicular component that can change dynamically depending on the parameters of the pulsed excitation. In particular, we demonstrate the formation of wave bullet-like excitations, which are generated in the domain walls and can propagate inside them during the cyclic motion of the vortex core. Based on numerical simulations we also show that, besides the core, there are four singularities formed at the corners of the pattern. The polarisation of these singularities has a direct relation to the vortex core, and can be switched dynamically by the wave bullets excited with a magnetic pulse of specific parameters. The subsequent dynamics of the Landau pattern is dependent on the particular configuration of the polarisations of the core and the singularities.

Journal Keywords: magnetism, spintronics, Core processes, Ferromagnetism, Magnetic properties and materials, Surfaces interfaces and thin films

Subject Areas: Physics, Materials, Mathematics

Facility: SOLEIL and ESRF

Documents:
srep36307.pdf