I– V characteristics and critical currents in superconducting/ferromagnetic bilayers

• Published in: Physica. C, Superconductivity Vol. 470; no. 19; pp. 877 - 879
• Main Authors: Ilyina, Ekaterina A., Cirillo, Carla, Attanasio, Carmine
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2010; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Critical current density; Critical currents; Exact sciences and technology; Ferromagnetic materials; Ferromagnetism; Fluid flow; I– V characteristics; Magnetic fields; Multilayers, superlattices , heterostructures; Niobium; Order parameters; Physics; Properties of type I and type II superconductors; Proximity effect; Superconducting films and low-dimensional structures; Superconducting/ferromagnetic bilayer; Superconductivity; Vortex lattices ,flux pinning, flux creep; Vortices; Critical current density; Proximity effect; I– V characteristics; Superconducting/ferromagnetic bilayer; Nickel alloys; Magnetic field effects; Ferromagnetic materials; Order parameters; I-V characteristics; Magnetic force microscopy; Niobium; Superconductors; Weak ferromagnetism; Palladium alloys; Transition elements; Vortex motion; IV characteristic; Heterostructures; Bilayers; Transition element alloys
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/j.physc.2010.02.043

Current–voltage ( I– V) characteristics and critical current density, J c , for the onset of vortex motion were measured at different magnetic fields, H, and temperatures, T, in a superconducting (S)/ferromagnetic (F) bilayer and in a single Nb film. We choose Nb as a superconductor and a weak ferromagnetic alloy, Pd 1− x Ni x with x = 16, as F. We found that J c was smaller for the S/F bilayer with respect to the single Nb film. The result was related to the reduced value of the superconducting order parameter in the bilayer.