Title :
Transport properties of discontinuous Co80Fe20/Al2O3 multilayers, prepared by ion beam sputtering
Author :
Kakazei, G.N. ; Freitas, P.P. ; Cardoso, Susana ; Lopes, A.M.L. ; Pereira de Azevedo, M.M. ; Pogorelova, Yu.G. ; Sousa, J.B.
Author_Institution :
Dept. de Fisica, Porto Univ., Portugal
fDate :
9/1/1999 12:00:00 AM
Abstract :
Ion beam sputtered Co80Fe20(t)/Al2O3 (30 Å) multilayers were obtained. The Co80Fe20 layers become discontinuous for nominal thickness t⩽18 Å. Tunnel magnetoresistance was measured in CIP and CPP geometries, reaching up to 6.5% at room temperature and 11% at 15 K, for as-deposited films in CIP geometry. The temperature dependence of MR was found quite different for the two geometries: fairly strong in the CIP case and almost absent in the CPP geometry. A model is proposed to explain these large differences in behavior
Keywords :
Permalloy; alumina; discontinuous metallic thin films; giant magnetoresistance; magnetic multilayers; sputtered coatings; tunnelling; 15 K; 18 angstrom; 30 angstrom; 300 K; Co80Fe20-Al2O3; discontinuous Co80Fe20/Al2O3 multilayers; granular MR materials; hysteresis; ion beam sputtered; short-range magnetic correlations; temperature dependence; transport properties; tunnel magnetoresistance; Bridges; Electric resistance; Geometry; Iron; Magnetic field measurement; Magnetic hysteresis; Magnetic multilayers; Nonhomogeneous media; Temperature dependence; Temperature measurement;
Journal_Title :
Magnetics, IEEE Transactions on
