Physica c-superconductivity and its applications vol:470 issue:19 pages:883-885
We experimentally studied the magnetoresistance of a superconducting Al microbridge fabricated on top of a ferromagnetic BaFe12O19 single crystal. Due to the presence of a one-dimensional domain structure in the ferromagnetic substrate, the superconducting critical temperature reaches its maximal value at the compensation field, vertical bar H vertical bar similar or equal to B-0, when superconductivity nucleates above magnetic domains of opposite polarity with respect to the applied magnetic field H (so-called reverse-domain superconductivity, B-0 being the amplitude of the z-component of the nonuniform magnetic field). Such localized superconductivity makes it possible to transfer superconducting currents without dissipation only along the magnetic domains, leading to a pronounced anisotropy of the resistance of this system at low temperatures. (C) 2010 Elsevier B.V. All rights reserved.