Levitation force from high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconducting thin-film disks

Riise, Anjali B.; Johansen, T. H.; Bratsberg, H.; Koblischka, Michael Rudolf; Shen, Y.Q.

doi:10.1103/physrevb.60.9855

Cited by 30 publications

(26 citation statements)

References 23 publications

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“…5 is that a maximum is found in the repulsive force when the PM is at some distance away from the HTS, rather than at the minimum distance. Experimentally this maximum has been observed in thin films, 17 while it was hardly observed in MTG samples. Riise et al accredited this maximum to the dimensions of the PM, which tends to vanish with larger t PM and smaller R PM .…”

Section: B Effect Of Specimen Shape On F Zmentioning

confidence: 86%

“…For b/aϭ0.05, the curve is completely symmetric. Experimentally, symmetrical F z (z) curves have been observed in YBCO thin films, 17 while in MTG bulk samples, the F z (z) curves are usually asymmetric. The reason for this is easy to understand: For a thin sample, the magnetic moment is saturated when the PM is close to the sample.…”

Section: B Effect Of Specimen Shape On F Zmentioning

confidence: 99%

“…And the disappearance of the maximum in MTG samples was explained by noting that bulk samples are less sensitive to a nonuniform field than films. 17 Another explanation comes from Sanchez and Navau, 33 who claimed that this maximum is a result of the minimum in the derivative of the field produced by the PM, based on a constant-field-gradient model. 31 They concluded that the maximum depends crucially on the side ratio b/a, the larger the side ratio b/a, the closer the maximum shifts to zero PM-HTS separation.…”

Section: B Effect Of Specimen Shape On F Zmentioning

confidence: 99%

“…4,[12][13][14][15][16] For MTG YBCO and RBCO samples, the force curve is usually asymmetrical, i.e., the absolute value of the attractive force is smaller than the maximum repulsive force ͉F a,max ͉ϽF r,max . 16 For thin films, the force curve is almost symmetrical ͉F a,max ͉ϷF r,max , 17 while for granular samples, the attractive force is hardly present. 18 Various parameters are very important in determining the levitation force.…”

Section: Introductionmentioning

confidence: 99%

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Calculation of the hysteretic force between a superconductor and a magnet

Qin

Liu

et al. 2002

Phys. Rev. B

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The magnetic levitation forces exerted on a high-temperature superconducting ͑HTS͒ disk by a cylindrical permanent magnet ͑PM͒ are calculated from first principles for superconductors with finite thickness. The current j( ,z) and field B( ,z) profiles in the HTS in the nonuniform magnetic field generated by the PM are derived. The levitation force depends nonlinearly on the critical current density j c and on the thickness of the HTS. The flux creep is described by a current-voltage law E( j)ϭE c ( j/ j c ) n , from which we show that the levitation force depends on the speed at which the PM approaches or recedes from the HTS, which accounts for the experimentally observed force creep phenomenon. The stiffness of the system is derived by calculating minor force loops. The numerical results reproduce many of the features observed in experiments.

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Section: B Effect Of Specimen Shape On F Zmentioning

confidence: 86%

Section: B Effect Of Specimen Shape On F Zmentioning

confidence: 99%

Section: B Effect Of Specimen Shape On F Zmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Calculation of the hysteretic force between a superconductor and a magnet

Qin

Liu

et al. 2002

Phys. Rev. B

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“…Some researchers measured the magnetic stiffness by a very small reverse displacement of 20 µm in order to reduce the experimental errors. 18 So small minor loop was usually hard to realize in the experiments of the PM-HTS levitation system.…”

Section: Introductionmentioning

confidence: 99%

Minor loop dependence of the magnetic forces and stiffness in a PM-HTS levitation system

Yang

2017

AIP Advances

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Numerical investigation of the relationship between magnetic stiffness and minor loop size in the HTS levitation system AIP Advances 7, 105327 (2017); https://doi.org/10.1063/1.5002890Influence of movement direction on levitation performance and energy dissipation in a superconducting maglev system AIP Advances 7, 115305 (2017); https://doi.org/10.1063/1.5002768Method for solution of the interaction between superconductor and permanent magnet

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In der Schwebe

Becker

Meiser

Koblischka

et al. 2011

Physik in unserer Zeit

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Eine Leviationswaage kann die Levitationskraft zwischen einer Hochtemperatur‐Supraleiter‐Probe und einem Permanentmagneten in Abhängigkeit des Abstands zwischen beiden messen. Der Artikel stellt eine Waagenkonstruktion vor, die sich für Praktika in Hochschulen und Schulen eignet. Der Versuch läuft computergesteuert. Für den Einsatz in fortgeschrittenen Semestern ist besonders interessant, dass man aus der Levitationskraft die kritische Stromdichte und das Haftkraftpotential der Flussschläuche in der Probe errechnen kann.

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Levitation force from high-Tcsuperconducting thin-film disks

Cited by 30 publications

References 23 publications

Calculation of the hysteretic force between a superconductor and a magnet

Calculation of the hysteretic force between a superconductor and a magnet

Minor loop dependence of the magnetic forces and stiffness in a PM-HTS levitation system

In der Schwebe

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