Research

Vortex-antivortex 'molecular crystals' in hybrid ferromagnet/superconductor structures


Reference:

Bending, S. J., Neal, J. S., Miloevic, M. V., Potenza, A., San Emeterio, L. and Marrows, C. H., 2009. Vortex-antivortex 'molecular crystals' in hybrid ferromagnet/superconductor structures. Journal of Physics: Conference Series, 150 (5), 052019.

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Official URL:

http://dx.doi.org/10.1088/1742-6596/150/5/052019

Abstract

We have used high resolution Hall probe microscopy to image vortex-antivortex (V-AV) 'molecules' induced in superconducting Pb films by the stray fields from square arrays of ferromagnetic Co/Pt dots. We have directly observed spontaneous V-AV pairs and studied how they interact with added 'free' (anti)fluxons in an applied magnetic field. We observe a rich variety of subtle phenomena arising from competing symmetries in our system which can either drive added antivortices to join AV shells around nanomagnets or stabilise the translationally symmetric AV lattice between the dots. Added vortices annihilate AV shells, leading eventually to a stable 'nulling' state with no free fluxons, which should exhibit a strongly (field-)enhanced critical current. At higher densities we actually observe vortex shells around the magnets, stabilised by the asymmetric anti-pinning potential. Our experimental findings are in good agreement with Ginzburg-Landau calculations.

Details

Item Type Articles
CreatorsBending, S. J., Neal, J. S., Miloevic, M. V., Potenza, A., San Emeterio, L. and Marrows, C. H.
DOI10.1088/1742-6596/150/5/052019
DepartmentsFaculty of Science > Physics
RefereedYes
StatusPublished
ID Code19107

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