Mechanics of a magnet and a Meissner superconducting ring at arbitrary position and orientation

Pérez-Díaz, José-Luis; García-Prada, Juan Carlos; Diaz-Garcia, J.A.

doi:10.1016/j.physc.2009.02.004

Cited by 10 publications

(7 citation statements)

References 12 publications

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“…10 The method has been shown to be in a good agreement with the experimental results. 4 The model is valid for a complete Meissner state, i.e., the applied magnetic field is lower than the first critical field.…”

Section: Modelmentioning

confidence: 55%

Stable thrust on a finite-sized magnet above a Meissner superconducting torus

Pérez-Díaz

Díez-Jiménez

Valiente–Blanco

et al. 2013

Journal of Applied Physics

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Forces and torques exerted by a superconducting torus on a permanent magnet have been mapped. It is demonstrated that stable orbits exist. Moreover, provided that the magnet remains in any of these orbits, the first critical field in the superconductor is never overpassed and the superconductor remains in the Meissner state. The consequent absence of hysteresis makes these kinds of device perfect candidates for non-frictional bearings or gyroscopes. V C 2013 American Institute of Physics.

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Section: Modelmentioning

confidence: 55%

Stable thrust on a finite-sized magnet above a Meissner superconducting torus

Pérez-Díaz

Díez-Jiménez

Valiente–Blanco

et al. 2013

Journal of Applied Physics

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“…This can be explained considering that it is a handmade bowl and not regular in shape, so the real equilibrium point for the magnet can be expected to be shifted to one side, or there may be different places where the magnet is more or less stable. In addition, the fact that the magnet is somewhat tilted with respect to the z axis provokes changes in the balance of forces [34].…”

Section: Considerations On the Radial Forcementioning

confidence: 99%

Magnetic levitation on a type-I superconductor as a practical demonstration experiment for students

Osorio¹,

Lahera²,

Suderow³

2012

Eur. J. Phys.

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Abstract. We describe and discuss an experimental set-up which allows undergraduate and graduate students to view and study magnetic levitation on a type-I superconductor. The demonstration can be repeated many times using one readily available 25 liter liquid helium dewar. We study the equilibrium position of a magnet that levitates over a lead bowl immersed in a liquid hand-held helium cryostat. We combine the measurement of the position of the magnet with simple analytical calculations. This provides a vivid visualization of magnetic levitation from the balance between pure flux expulsion and gravitation. The experiment contrasts and illustrates the case of magnetic levitation with high temperature type-II superconductors using liquid nitrogen, where levitation results from partial flux expulsion and vortex physics.

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“…Various approaches were proposed in the literature to attack the problem of a magnet levitating above a superconductor by introducing different models such as the diamagnetic model, [3][4][5][6] Bean's critical state model, [7][8][9] and the frozen image model. [10] Most of the published experimental and theoretical studies were focusing on the possibility of achieving optimal stable levitation of a magnet flying above a superconductor.…”

Section: Introductionmentioning

confidence: 99%

Stability of magnetic tip/superconductor levitation systems

Alqadi¹

2015

Chinese Phys. B

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The vertical stability of a magnetic tip over a superconducting material is investigated by using the critical state and the frozen image models. The analytical expressions of the stiffness and the vibration frequency about the equilibrium position are derived in term of the geometrical parameters of the magnet/superconductor system. It is found that the stability of the system depends on the shape of the superconductor as well as its thickness.

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Mechanics of a magnet and a Meissner superconducting ring at arbitrary position and orientation

Cited by 10 publications

References 12 publications

Stable thrust on a finite-sized magnet above a Meissner superconducting torus

Stable thrust on a finite-sized magnet above a Meissner superconducting torus

Magnetic levitation on a type-I superconductor as a practical demonstration experiment for students

Stability of magnetic tip/superconductor levitation systems

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