The Amsterdam high-field facility

Abstract

A description is given of the high-field facility at the University of Amsterdam. At present, two magnets are operational in which magnetic fields which are constant within 10 −4 can be generated with a typical duration of 0.1 s. The maximum available field is 40 T and can be reached in only one of the magnets. In this magnet, experiments can be carried out at liquid-helium temperatures and at 77 K. The other magnet, in which fields up to 30 T can be generated, can be equipped with a variable-temperature cryostat in which any temperature between 1.5 K and room temperature can be stabilized, or with a pumped 3He cryostat for temperatures down to 400 mK. The types of experiments that can be carried out in the Amsterdam high-field facility include magnetization and magnetotransport measurements at hydrostatic pressures up to 5 kbar, measurements of quantum oscillations in the De Haas-Van Alphen and Shubnikov-De Haas effects. Special dedicated techniques have been used for non-standard measurements, like for example, time-dependent magnetic relaxation, the quantum Hall effect in thin semiconducting layers, the influence of optical irradiation on galvanomagnetic effects in semiconductors. Within the Netherlands, the Amsterdam high-field facility and the high magnetic field laboratory at Nijmegen University, where static fields up to 30 T can be realized in a hybrid magnet system, have recently joined to form the Amsterdam-Nijmegen Magnet Laboratory (ANML).