title: GMR effect in CuCo annealed melt-spun ribbons.
abstract: A thorough microstructural and magnetic analysis has been performed on as-quenched and annealed (475 and 525 degrees C, 1 hour) melt-spun Cu100-xCox (x = 10 and 15) granular alloys, presenting a giant magnetoresistance (GMR) effect. The annealed samples are inhomogeneous with respect to the Co-particle sizes and interparticles distances and, therefore, these particles present superparamagnetic and ferromagnetic behaviours, which determine the GMR response. The samples x = 15, treated at 525 degrees C during 1 hour, presented the best GMR ratio (approximately 5% at room temperature to be the highest value approaching roughly to the saturation under an applied magnetic field of 15 KOe), with the coexistence of Co-particles with both kinds of magnetic behaviour.
authors.affiliation: New Materials Department, CIDETEC, 20009 San Sebastián, Spain.
authors.forename: N
authors.initials: N
authors.lastname: Murillo
authors.forename: H
authors.initials: H
authors.lastname: Grande
authors.forename: I
authors.initials: I
authors.lastname: Etxeberria
authors.forename: J J
authors.initials: JJ
authors.lastname: Del Val
authors.forename: J
authors.initials: J
authors.lastname: González
authors.forename: S
authors.initials: S
authors.lastname: Arana
authors.forename: F J
authors.initials: FJ
authors.lastname: Gracia
mesh_terms: D003035:Cobalt / Q000032:analysis / Q000737:chemistry*; D003300:Copper / Q000032:analysis / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D017097:Electric Impedance; D006358:Hot Temperature; D008280:Magnetics; D008422:Materials Testing; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000032:analysis / Q000737:chemistry*; D010316:Particle Size
chemical_list: D003035:Cobalt; D003300:Copper