THE FIELD OF A MAGNETIC DIPOLE AND THE POLARIZABILITY OF A SUPERCONDUCTING OBJECT EMBEDDED IN THE INTERFACE BETWEEN MAGNETIC MATERIALS

In this paper, a careful study is made of the magnetostatic potential and fleld of a magnetic dipole embedded in, and with dipole moment parallel to, the interface between two magnetic regions. Unlike the case of a magnetic dipole perpendicular to the interface, the detailed position of the current of the dipole relative to the location of the interface has a profound efiect on the value of the fleld produced away from the dipole. As a consequence, the question of deflning and determining the magnetic polarizability of a superconducting object partially embedded in a magnetic interface is examined. The results of this paper are important for the proper modeling of arrays of scatterers embedded in an interface, such as frequency-selective surfaces (FSSs) and metafllms.