Transport properties of discontinuous Co{sub 80}Fe{sub 20}/Al{sub 2}O{sub 3} multilayers, prepared by ion beam sputtering

Journal Article · Wed Sep 01 00:00:00 EDT 1999 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers)

DOI:https://doi.org/10.1109/20.801017· OSTI ID:20000664

Kakazei, G N; Freitas, P P; Cardoso, S; Lopes, A M.L.; Pereira de Azevedo, M M; Pogorelov, Y G; Sousa, J B

Ion beam sputtered Co{sub 80}Fe{sub 20}(t)/Al{sub 2}O{sub 3}(30 {angstrom}) multilayers were obtained. The Co{sub 80}Fe{sub 20} layers become discontinuous for nominal thicknesses T {le} 18{angstrom}. 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.

• Research Organization: Univ. do Porto (PT)
• OSTI ID: 20000664
• Journal Information: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers), Vol. 35, Issue 5Pt1; Conference: 1999 international magnetics conference (Intermag '99), Kyongju (KR), 05/18/1999--05/21/1999; Other Information: PBD: Sep 1999; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
LAYERS
COBALT BASE ALLOYS
IRON ALLOYS
ALUMINIUM OXIDES
COMPOSITE MATERIALS
MAGNETORESISTANCE
TUNNEL EFFECT
TEMPERATURE DEPENDENCE
MATHEMATICAL MODELS