Projects per year
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.
Original language | English |
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Article number | 052019 |
Journal | Journal of Physics: Conference Series |
Volume | 150 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2009 |
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Dive into the research topics of 'Vortex-antivortex 'molecular crystals' in hybrid ferromagnet/superconductor structures'. Together they form a unique fingerprint.Projects
- 2 Finished
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Current - Driven Domain Wall Motion in Artificial Magnetic Domain Structures
Engineering and Physical Sciences Research Council
1/05/09 → 31/01/13
Project: Research council
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A SCANNING HALL PROBE MICROSCOPE FOR HIGH RESOLUTION MILLIKE LVIN MAGNETIC IMAGING
Engineering and Physical Sciences Research Council
1/01/06 → 31/12/08
Project: Research council