Suppression of the magnetic moment of a hard superconductor under the action of a transverse magnetic field

The suppression of the magnetic moment M of a superconducting plate by a ma gnetic field It(t), changing in cycle, applied perpendicularly to a DC magn etic field H, has been observed and studied. Numerical simulations within t he framework of two existing theoretical approaches have been performed. It is found that the double critical state model (Clem, Perez-Gonzalex, Phys. Rev. B 30 (1984) 5041) describes the process of the M(h) suppression quali tatively well in the first quarter-period for relatively high values of h, whereas the two-velocity hydrodynamic model (Voloshin et al., JETP 84 (1997 ) 592) describes adequately all main features of this phenomenon. (C) 2000 Elsevier Science B.V. All rights reserved.