Spin valves with free and pinned layers constructed from Co 50Fe 50 exhibit higher current-perpendicular-to-plane (CPP) giant-magnetoresistance (GMR) than the conventional Co 90Fe 10 alloy. In order to investigate this enhancement mechanism, we measured CPP-GMR and the crystalline structure of spin valves with Co 90Fe 10, Co 70Fe 30, Co 50Fe l50 and Co 20Fe 80 for pinned and free layers. The spin valves with Co 50Fe 50 and Co 20Fe 80 show the same CPP-GMR and these are higher than those with Co 90Fe 10 and Co 70Fe 30. 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.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics