Interactive effect of impurities on giant magnetoresistance of Co-Fe/Cu multilayers

Masakiyo Tsunoda, Hideo Arai, Daisuke Takahashi, Satoshi Miura, Migaku Takahashi

研究成果: ジャーナルへの寄稿学術論文査読

8 被引用数 (Scopus)

抄録

Giant magnetoresistance of Co-Fe-B/Cu multilayers fabricated in the sputtering atmosphere, where the amount of oxygen impurity is varied, is discussed in connection with their interfacial roughness. The magnetoresistance (MR) ratio of Co-Fe/Cu multilayers is enhanced by up to 33% when the oxygen content is varied between 10 and 100 ppm of processing Ar gas. The enhancement of the MR ratio was due to the flattening effect of impurity oxygen on the multilayer interfaces: the root mean square roughness of the multilayer was decreased from 7.5 to 5Å. With increasing boron content in Co-Fe layers, however, the enhancing effect of MR ratio by oxygen diminished and nearly vanished for 12at%-B-(Co-Fe) case. The strong affinity of boron for oxygen is suggested as a probable mechanism.

本文言語英語
ページ(範囲)189-191
ページ数3
ジャーナルJournal of Magnetism and Magnetic Materials
240
1-3
DOI
出版ステータス出版済み - 2002 2月

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