(Fe,Co)-X-O (X=Y, Nd, Sm, Gd, Tb, Dy)系ナノグラニュラー膜の巨大磁気抵抗効果 (<特集>多層膜・人工格子・グラニューラー)

概要

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We studied the giant magnetoresistance (GMR) and related properties of (Fe,Co)-X-O (X=Y, Nd, Sm, Gd, Tb, Dy)films. The films were prepared by conventional rf sputtering of Fe, Co or Fe-Co, and X_2O_3 targets. The ft1ms seem to have a granular strudtute composed of nano-size metallic grains and thin oxide boundaries. The films ekhibited superparamagnetic properties and high electrical resistivities of 10^4-10^6 μΩcm, and had negative and isotropic magnetoresistances at room temperature. The values of Δρ/ρ_o in Co-based films were larger than those of Fe-based films, and a GMR effect of 2.7% at 500 Oe was observed for Co_<51.0>Sm_<10.7>O_<38.3> film at room temperature. The GMR effect observed in the granular strucure is attributed to spin-dependent tunnelint conductance through a thin oxide layer between grains in the film.
社団法人日本磁気学会の論文
1997-04-15