Poster (Scientific congresses and symposiums)
A novel approach towards manipulation of vortex matter in a superconductor with micromagnetic structures
Shaw, Gorky
2017The 28th International Conference on Low Temperature Physics (LT28)
 

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Keywords :
magneto-opitcal imaging; S/F hybrids; vortex matter
Abstract :
[en] Hard permanent magnetic materials offer a number of advantages over softer magnetic materials as sources of vortex pinning in a superconductor, like greater stability and larger magnetic field amplitudes. Permanent micromagnet structures prepared using thermomagnetic patterning (TMP) present an interesting and so far unexplored option for controlled artificial pinning. We have investigated the vortex matter in superconductor/TMP micromagnet heterostructures (Nb-NdFeB) using quantitative Magneto-Optical Imaging (MOI). Comprehensive protocols have been developed for calibrating and converting Faraday rotation data acquired by MOI to magnetic field maps. These protocols reveal the comparatively weaker magnetic response of the superconductor from the background of larger fields associated with the magnetic layer in its vicinity. Further, TMP micromagnet structures have been imprinted in a Permalloy (Py) layer to obtain flexible magnetic landscapes for flux guidance in a Nb layer below it. Both smooth flux penetration and vortex avalanches in Nb are observed to be strongly influenced by the micromagnetic patterns. Our study offers new insights into the peculiarities of the vortex state in these superconductor-micromagnet heterostructures.
Research center :
EPNM - Experimental Physics of Nanostructured Materials
Disciplines :
Physics
Author, co-author :
Shaw, Gorky ;  Université de Liège > Département de physique > Physique expérimentale des matériaux nanostructurés
Language :
English
Title :
A novel approach towards manipulation of vortex matter in a superconductor with micromagnetic structures
Publication date :
10 August 2017
Event name :
The 28th International Conference on Low Temperature Physics (LT28)
Event organizer :
Chalmers University of Technology
Event place :
Gothenburg, Sweden
Event date :
09/08/2017 – 16/08/2017
By request :
Yes
Audience :
International
European Projects :
FP7 - 600405 - BEIPD - Be International Post-Doc - Euregio and Greater Region
Name of the research project :
Vortex matter in heterostructures of superconductors and thermomagnetically patterned micromagnets
Funders :
ULiège - Université de Liège [BE]
UE - Union Européenne [BE]
CE - Commission Européenne [BE]
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since 12 September 2017

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