Magnetization and Levitation Characteristics of HTS Tape Stacks in Crossed Magnetic Fields

In this paper, we present the results of the measurements of HTS tape stack magnetization and magnetic levitation forces between the permanent-magnet NdFeB and the stacks composed of n = 5-100 tapes of ReBCO (with the size of 12 mm × 12 mm) in the field cooling and zero-field cooling modes in a crossed magnetic field. The alternating magnetic field parallel to the surface of the tapes was produced by a copper coil with the amplitude up to 80-Oe frequency was varied in the range from 50 to 400 Hz. Measurements were carried out in liquid nitrogen. The dependencies of the magnetization of the stacks and the levitation force on the magnitude and frequency of the alternating magnetic field were obtained. The suppression of the levitation force and magnetization in a crossed field for the stacks of various thicknesses was shown. The results were compared with the characteristics of the bulk superconductors.