金属-非金属ナノグラニュラー膜の構造と巨大磁気抵抗効果

概要

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The relationship between the giant magnetoresistance (GMR) and the nano-granular structure of (Fe, Co)/Ai_2O_3 films prepared by a tandem deposition method was examined.The tructure of the films was controlled by changing the rotation speed of a substrate holder. In this way, the size of the metallic granules in the film was changed independently of the film composition.In the case of Fe/Al_2o_3 films, the average diameter of a metallic granule decreased from 2.5 to 1.5 nm with an increase in the rotation speed of the substrate holder.On the other hand, the width of the Al oxide boundary among metallic granules was estimated to be about 0.5-1 nm.The MR ratio increased with a decrease in size of the metal granules. So-called coulomb blockade effect is disussed the influence of the granule size on the MR ratio.
社団法人日本磁気学会の論文
1998-04-15