Abstract
Spin valves with free and pinned layers constructed from Co50Fe50 exhibit higher current-perpendicular-to-plane (CPP) giant-magnetoresistance (GMR) than the conventional Co90Fe10 alloy. In order to investigate this enhancement mechanism, we measured CPP–GMR and the crystalline structure of spin valves with Co90Fe10, Co70Fe30, Co50Fe50 and Co20Fe80 for pinned and free layers. The spin valves with Co50Fe50 and Co20Fe80 show the same CPP–GMR and these are higher than those with Co90Fe10 and Co70Fe30. These results do not agree with the report about the Fe–Ni and Co–Ni systems that calculated that concludes that the stoichiometric concentration has the highest CPP–GMR. In the Co–Fe system, the crystalline structure and the strain also contribute to CPP–GMR.
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