Abstract
| Original language | English |
|---|---|
| Article number | 052019 |
| Journal | Journal of Physics: Conference Series |
| Volume | 150 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2009 |
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Vortex-antivortex 'molecular crystals' in hybrid ferromagnet/superconductor structures. / Bending, Simon J; Neal, J S; Miloevic, M V; Potenza, A; San Emeterio, L; Marrows, C H.
In: Journal of Physics: Conference Series, Vol. 150, No. 5, 052019, 2009.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Vortex-antivortex 'molecular crystals' in hybrid ferromagnet/superconductor structures
AU - Bending, Simon J
AU - Neal, J S
AU - Miloevic, M V
AU - Potenza, A
AU - San Emeterio, L
AU - Marrows, C H
PY - 2009
Y1 - 2009
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=77952519962&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1088/1742-6596/150/5/052019
U2 - 10.1088/1742-6596/150/5/052019
DO - 10.1088/1742-6596/150/5/052019
M3 - Article
VL - 150
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - 5
M1 - 052019
ER -