Publication

Possibilities and limitations of using Preisach model for hysteresis in superconductors

Marten Sjöström
2001
Journal Articles

Abstract

Superconductors of type-II are partially penetrated by magnetic flux, where the pinning of flux tubes constitutes a memory that gives rise to a hysteresis. However, the hysteresis gradually disappears when a transport current approaches the critical current. This paper investigates what possibilities and limitations the Preisach model has to describe this hysteresis. Previous results are complimented by demonstrating the limitation to higher harmonics, the computation of an inverse model including an inductive part, and by modelling the gradual disappearing hysteresis with a saturation.

Official source

https://infoscience.epfl.ch/entities/publication/67f59689-e02d-400f-9d78-e33c153bdc93

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Marten Sjöström
2001
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/67f59689-e02d-400f-9d78-e33c153bdc93

About this result

Related concepts (32)

Hysteresis

Hysteresis is the dependence of the state of a system on its history. For example, a magnet may have more than one possible magnetic moment in a given magnetic field, depending on how the field changed in the past. Plots of a single component of the moment often form a loop or hysteresis curve, where there are different values of one variable depending on the direction of change of another variable. This history dependence is the basis of memory in a hard disk drive and the remanence that retains a record of the Earth's magnetic field magnitude in the past.

Magnetic hysteresis

Magnetic hysteresis occurs when an external magnetic field is applied to a ferromagnet such as iron and the atomic dipoles align themselves with it. Even when the field is removed, part of the alignment will be retained: the material has become magnetized. Once magnetized, the magnet will stay magnetized indefinitely. To demagnetize it requires heat or a magnetic field in the opposite direction. This is the effect that provides the element of memory in a hard disk drive.

Superconductivity

Superconductivity is a set of physical properties observed in certain materials where electrical resistance vanishes and magnetic fields are expelled from the material. Any material exhibiting these properties is a superconductor. Unlike an ordinary metallic conductor, whose resistance decreases gradually as its temperature is lowered, even down to near absolute zero, a superconductor has a characteristic critical temperature below which the resistance drops abruptly to zero.

Related publications (31)

Possibilities and limitations of using Preisach model for hysteresis in superconductors

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