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Some features of bulk melt-textured high-temperature superconductors subjected to alternating magnetic fields
Vanderbemden, Philippe; Molenberg, Isabel; Simeonova, Pavlina et al.
2014In Journal of Physics. Conference Series, 558, p. 012016
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Keywords :
magnetic measurements; superconductors
Abstract :
[en] Monolithic, large grain, (RE)Ba2Cu3O7 high-temperature superconductors (where RE denotes a rare-earth ion) are known to be able to trap fields in excess of several teslas and represent thus an extremely promising competing technology for permanent magnet in several applications, e.g. in motors and generators. In any rotating machine, however, the superconducting permanent magnet is subjected to variable (transient, or alternating) parasitic magnetic fields. These magnetic fields interact with the superconductor, which yields a reduction of the remnant magnetization. In the present work we quantify these effects by analysing selected experimental data on bulk melt-textured superconductors subjected to AC fields. Our results indicate that the non-uniformity of superconducting properties in rather large samples might lead to unusual features and need to be taken into account to analyse the experimental data. We also investigate the evolution of the DC remnant magnetization of the bulk sample when it is subjected to a large number of AC magnetic field cycles, and investigate the experimental errors that result from a misorientation of the sample or a mispositioning of the Hall probe. The time-dependence of the remnant magnetization over 100000 cycles of the AC field is shown to display distinct regimes which all differ strongly from the usual decay due to magnetic relaxation.
Research center :
SUPRATECS - Services Universitaires pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - ULiège
Disciplines :
Physics
Electrical & electronics engineering
Author, co-author :
Vanderbemden, Philippe  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Molenberg, Isabel ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Applied and Computational Electromagnetics (ACE)
Simeonova, Pavlina;  Bulgarian Academy of Science - BAS > Institute of Solid State Physics
Lovchinov, Vassil;  Bulgarian Academy of Science - BAS > Institute of Solid State Physics
Language :
English
Title :
Some features of bulk melt-textured high-temperature superconductors subjected to alternating magnetic fields
Publication date :
2014
Event name :
18th International School on Condensed Matter Physics: "Challenges of Nanoscale Science: Theory, Materials, Applications"
Event place :
Varna, Bulgaria
Event date :
1-6 September 2014
By request :
Yes
Audience :
International
Journal title :
Journal of Physics. Conference Series
ISSN :
1742-6588
eISSN :
1742-6596
Publisher :
Institute of Physics, Bristol, United Kingdom
Volume :
558
Pages :
012016
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
WBI - Wallonie-Bruxelles International [BE]
BAS - Bulgarian Academy of Sciences [BG]
Available on ORBi :
since 15 December 2014

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