INHOMOGENEOUS SPLITTING OF IMPURITY-SPIN ENERGY-LEVELS IN MESOSCOPIC WIRES

The Hamiltonian, which describes the surface-induced anisotropy for im purity spin in mesoscopic wires of dilute magnetic alloys, is derived for the wires with a rectangular cross-section and rough surfaces. We show that due to the combined effect of the four surfaces of the wire, the impurity-spin energy spectra are substantially different from tho se in a semi-infinite host. Moreover, we find that a moderate roughnes s of the surface enhances the splitting of the impurity-spin energy le vel. (C) 1998 Elsevier Science Ltd. All rights reserved.