GMR in granular CuFe with a face cebteres tetragibak strycture of iron

Abstract

Granular thin CuFe films with a face centered tetragonal (fct) structure of Fe clusters in Cu matrix show a giant magnetoresistance effect. The samples were prepared by co-deposition of 57Fe and Cu metal in Ultra High Vacuum. The role of the scattering of conduction electrons at the interface between Fe ultrafine particles and Cu matrix has been studied by Moù ssbauer spectroscopy and magnetoresitivity measurements. The ratio of Fe atoms located at Cu/Fe interface and in the ultrafine particles (bulk) was resolved by Moù ssbauer spectroscopy. In the system consisting of ultrafine fct-Fe particles imbedded in Cu matrix the giant magnetoresistance effect is not correlated to the ratio of interface/bulk in contrast to observations in FeAg granular system. The spin-dependent scattering of conduction electrons occurs within the ferromagnetic fct-Fe particles.