Structure and Effect of Giant Magnetoresistance in Three-Layered Films FeNi/Cu/Co

Authors A.G. Basov1 , S.I. Vorobjov1, Yu.O. Shkurdoda2 , L.V. Dekhtyaruk3

1 Sumy State University, 2, Rimsky-Korsakov Str., 40007 Sumy, Ukraine

2 Sumy State Pedagogical University, 87, Romens'ka Str., 40002 Sumy, Ukraine

3 Kharkiv State Technical University of Building and Architecture 40, Sumska Str., 61002 Kharkiv, Ukraine

Е-mail [email protected], [email protected]
Issue Volume 2, Year 2010, Number 3
Dates Received 27.09.2010, in final form - 29.11.2010
Citation A.G. Basov, S.I. Vorobjov, Yu.O. Shkurdoda, L.V. Dekhtyaruk, J. Nano- Electron. Phys. 2 No3, 69 (2010)
PACS Number(s) 72.10.Fk, 72.15.Lh, 73.40.Jn, 73.50.Gr, 73.50.Jt, 75.30.Vn
Keywords Three-layered magnetic films, Giant magnetoresistance, Magnetoresistive ratio, Resistor model, Spin-dependent scattering.
Dependence of the magnetoresistance in magnetic FeNi/Cu/Co sandwich films was investigated theoretically and experimentally. It was found that for small values of the thickness ratio of magnetic metal layers d2/d1 << 1 (dj (j = 1, 2) is the thickness of the j-th metal layer), the giant magnetoresistance effect (δ = (ρ(0) – ρ(H))/ρ(H) ~ d2) increases with thickness of the top (covering) magnetic layer. At the same time, if the inverse inequality takes place, the magnetoresistance ratio decreases as 1/d2. When the equality d2/d1 = (ρ11ρ12/ρ21ρ22)0.5 (ρjs is the resistivity of the s-th spin channel) holds, this effect is maximal.

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