Bulk high temperature superconductors for magnet applićations

Campbell, A.M.; Cardwell, DA

doi:10.1016/s0011-2275(97)00068-4

Cited by 148 publications

(90 citation statements)

References 21 publications

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“…Moreover, the interest in crossed fields has been revived with the increasing potential of singledomain bulk melt-processed R-Ba-Cu-O ͓͑R͒BCO, where R denotes a rare-earth ion͔ to trap significant magnetic fields, 5 which gives rise to the possibility of high-field permanentmagnet-like devices. 6,7 Applying a magnetic field in a direction transverse to that of the premagnetization in a bulk superconductor may cause significant decay of the trapped field, [8][9][10][11][12][13][14][15][16][17][18] which could result in the failure of such devices in practical applications. The behavior of bulk high-temperature superconductors ͑HTSs͒ in the crossed-field configuration is therefore of practical relevance as well as of fundamental academic interest.…”

Section: Introductionmentioning

confidence: 99%

Behavior of bulk high-temperature superconductors of finite thickness subjected to crossed magnetic fields: Experiment and model

et al. 2007

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Crossed-magnetic-field effects on bulk high-temperature superconductors have been studied both experimentally and numerically. The sample geometry investigated involves finite-size effects along both ͑crossed-͒ magnetic-field directions. The experiments were carried out on bulk melt-processed Y-Ba-Cu-O single domains that had been premagnetized with the applied field parallel to their shortest direction ͑i.e., the c axis͒ and then subjected to several cycles of the application of a transverse magnetic field parallel to the sample ab plane. The magnetic properties were measured using orthogonal pickup coils, a Hall probe placed against the sample surface, and magneto-optical imaging. We show that all principal features of the experimental data can be reproduced qualitatively using a two-dimensional finite-element numerical model based on an E-J power law and in which the current density flows perpendicularly to the plane within which the two components of magnetic field are varied. The results of this study suggest that the suppression of the magnetic moment under the action of a transverse field can be predicted successfully by ignoring the existence of flux-free configurations or flux-cutting effects. These investigations show that the observed decay in magnetization results from the intricate modification of current distribution within the sample cross section. The current amplitude is altered significantly only if a field-dependent critical current density J c ͑B͒ is assumed. Our model is shown to be quite appropriate to describe the cross-flow effects in bulk superconductors. It is also shown that this model does not predict any saturation of the magnetic induction, even after a large number ͑ϳ100͒ of transverse field cycles. These features are shown to be consistent with the experimental data.

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Section: Introductionmentioning

confidence: 99%

Behavior of bulk high-temperature superconductors of finite thickness subjected to crossed magnetic fields: Experiment and model

et al. 2007

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“…T HE potential of bulk melt-processed YBCO single domains to trap significant magnetic field at 77 K makes them particularly attractive for a variety of engineering applications including superconducting magnets, magnetic bearings and motors [1], [2]. Before such devices can be created, the characteristics of these trapped field magnets need to be well understood.…”

Section: Introductionmentioning

confidence: 99%

The Numerical Modeling and Measurement of Demagnetization Effect in Bulk YBCO Superconductors Subjected to Transverse Field

Hong

Vanderbemden

Pei

et al. 2008

IEEE Trans. Appl. Supercond.

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Abstract-In this paper, the crossed field demagnetization effect of the bulk type-II superconducting materials in a variety of external magnetic field condition has been investigated both numerically and experimentally. A melt-textured YBCO bulk sample was magnetized along the axial direction and after that a transverse field perpendicular to the central axis applied. The collapse of the original trapped field was measured using a Quantum Design Physical Property Measurement System. A numerical solver based on critical state model is proposed to simulate the measured results.Index Terms-Bulk superconductor, critical state model, crossed field effect, finite element method, numerical modeling.

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“…Therefore these materials are promising candidates for various engineering applications [7,8]. The two main parameters relevant to applications-H irr and J c -can be determined either by transport (direct) or magnetic (indirect) measurements.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and transport measurements on melt-textured DyBCO single domains

Vanderbemden

Misson

Ausloos

et al. 2002

Physica C: Superconductivity

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In this communication we report critical current measurements of melt processed DyBa 2 Cu 3 O 7-x samples determined by several measuring techniques. First the material was characterized by AC susceptibility and DC magnetization. The results are characteristic of good quality melt-processed (RE)BCO material with T c ≈ 89 K and J c (77 K, 1 T) ≈ 10 4 A/cm 2 . Next, pulsed currents were used in order to determine both I-V curves and transport critical currents. The origin of the discrepancy between transport and magnetic data has been discussed. The results point out significant local variations of the critical current density throughout the single domain.

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Bulk high temperature superconductors for magnet applićations

Cited by 148 publications

References 21 publications

Behavior of bulk high-temperature superconductors of finite thickness subjected to crossed magnetic fields: Experiment and model

Behavior of bulk high-temperature superconductors of finite thickness subjected to crossed magnetic fields: Experiment and model

The Numerical Modeling and Measurement of Demagnetization Effect in Bulk YBCO Superconductors Subjected to Transverse Field

Magnetic and transport measurements on melt-textured DyBCO single domains

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