Energy Loss and Regimes of Flux Dynamics in BSCCO Tapes Above the Engineering Critical Current

Lukovsky, G.; Friedman, A.; Wolfus, Y.; Burlachkov, L.; Yeshurun, Y.

doi:10.1109/tasc.2007.900004

Cited by 5 publications

(3 citation statements)

References 17 publications

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“…In our device, however, vortex flipping is possible due to vortex fields acting on ferromagnetically aligned electrons through exchange interaction. This characteristic may find applications in reducing AC losses 33,34 and preventing flux jumps. 28 Provided superconductor thickness is on the order of the Ginzburg Landau coherence length and the ferromagnet's exchange field is low, in order to have a large Cooper pair penetration, this effect should be observable in other materials.…”

Section: Discussionmentioning

confidence: 99%

Vortex flipping in superconductor/ferromagnet spin-valve structures

et al. 2013

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We report in-plane magnetization measurements on Ni/Nb/Ni/CoO and Co/Nb/Co/CoO spin valve structures with one of the ferromagnetic layers pinned by an antiferromagnetic layer. In samples with Ni below the superconducting transition T c , our results show strong evidence of vortex flipping driven by ferromagnet magnetization. This is a direct consequence of the proximity effect that leads to vortex supercurrent leakage into the ferromagnets. Here, the polarized electron spins are subject to the vortices' magnetic field, occasioning vortex flipping. Such a novel mechanism has been made possible by fabrication of the ferromagnet/superconductor/ferromagnet/antiferromagnet multilayered spin valves with an S layer thin enough to barely confine vortices inside as well as F layers thin enough to align and control magnetization within the plane. When Co is used, the vortex flipping effect is not observed. This is attributed to the shorter coherence length of Co. Interestingly, a reduction in the pinning field of about 400 Oe is observed instead when the Nb layer is in the superconducting state. This effect cannot be explained in terms of vortex fields. In view of these facts, any explanation must be directly related to the proximity effect and thus a remarkable phenomenon that deserves further investigation.

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Section: Discussionmentioning

confidence: 99%

Vortex flipping in superconductor/ferromagnet spin-valve structures

et al. 2013

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“…The properties of the superconductor can be qualitatively studied from the voltage signal [13][14][15][16][17][18][19]. However, the voltage in a coil where it circulates an AC current I = I m cos ωt has a very large inductive component (proportional to sin ωt) which does not depend on the material properties; neither does it contribute to the AC loss.…”

Section: On the Voltage Compensationmentioning

confidence: 99%

“…Furthermore, in addition to the AC loss, the shape of the voltage signal in the coil is also interesting for both the understanding of the loss mechanisms and applications [13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental study of AC loss in high temperature superconductor single pancake coils

Šouc

Pardo

Vojenčiak

et al. 2008

Supercond. Sci. Technol.

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The electromagnetic properties of a pancake coil in AC regime as a function of the number of turns is studied theoretically and experimentally. Specifically, the AC loss, the coil critical current and the voltage signal are discussed. The coils are made of Bi 2 Sr 2 Ca 2 Cu 3 O 10 /Ag (BiSCCO) tape, although the main qualitative results are also applicable to other kinds of superconducting tapes, such as coated conductors. The AC loss and the voltage signal are electrically measured using different pick up coils with the help of a transformer. One of them avoids dealing with the huge coil inductance. Besides, the critical current of the coils is experimentally determined by conventional DC measurements. Furthermore, the critical current, the AC loss and the voltage signal are simulated, showing a good agreement with the experiments. For all simulations, the field dependent critical current density inferred from DC measurements on a short tape sample is taken into account. 1 In fact, this condition is not strictly sufficient. The external field must be much larger than the self field of a stack made of as many tapes as those in the radial direction when the radial field dominates the AC loss (and equivalent with the axial direction when the dominant is the axial field).

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Negative resistance and heat dissipation in superconducting wires in an ac magnetic field

Burlachkov

Fuzailov

2022

Physica C: Superconductivity and its Applications

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Energy Loss and Regimes of Flux Dynamics in BSCCO Tapes Above the Engineering Critical Current

Cited by 5 publications

References 17 publications

Vortex flipping in superconductor/ferromagnet spin-valve structures

Vortex flipping in superconductor/ferromagnet spin-valve structures

Theoretical and experimental study of AC loss in high temperature superconductor single pancake coils

Negative resistance and heat dissipation in superconducting wires in an ac magnetic field

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