Influence of the iron and cobalt interfacial layers on the magnetic and magnetoresistance properties of (Py/Cu) 20

We have investigated the magnetic and magnetoresistance (MR) properties of [Py/Cu 9 Å] 20, by addition of thin Co and Fe interface layers, and by varying the thicknesses of Py from 10 to 80 Å. The temperature dependence of MR and resistivity from 4.2 to 300 K has been analyzed using a semiclassical...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2002-04, Vol.242, p.541-543
Main Authors: Nagamine, L.C.C.M., Biondo, A., Pereira, L.G., Souza, A.F., Mello, A., Schmidt, J.E., Fontes, M.B., Saitovitch, E.Baggio
Format: Article
Language:English
Subjects:
Interface resistance
Magnetoresistance—multilayer
Spin-dependent scattering
Sputtering magnetron
Thin films—multilayer
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Summary:We have investigated the magnetic and magnetoresistance (MR) properties of [Py/Cu 9 Å] 20, by addition of thin Co and Fe interface layers, and by varying the thicknesses of Py from 10 to 80 Å. The temperature dependence of MR and resistivity from 4.2 to 300 K has been analyzed using a semiclassical theoretical model. The increase of giant magnetoresistance amplitudes for [Co 3 Å/Py/Co 3 Å/Cu 9 Å] 20 has been interpreted in terms of a reinforcement of the magnetic ordering of the Py/Co/Cu interfaces. It also has been attributed to a more selective transmission of the spin-down through the interfaces of Py/Co and Co/Cu, compared to the one through the Py/Cu interface. Nevertheless, with the addition of 3 Å of Fe at the interfaces Py/Cu, one observes a strong reduction of the magnetoresistance amplitudes.
ISSN:0304-8853
DOI:10.1016/S0304-8853(01)01142-8