NiO/NiFeCo/Cu/NiFeCo自旋阀结构的巨磁电阻效应及影响因素的研究  

Study on Influence Factors of GMR Effect in NiO/NiFeCo/Cu/NiFeCo Spin-Valves

作　　者：卢志红[1,2,3] 李铁[1,2,3] 邱进军 荀坤[1,2,3] 沈鸿烈 姚新华 沈松华 林更琪 李佐宜 沈德芳 

机构地区：[1]中国科学院冶金所光盘与磁性材料实验室 [2]功能材料国家重点实验室 [3]华中理工大学固体电子学系

出　　处：《功能材料》1999年第3期256-257,260,共3页Journal of Functional Materials

摘　　要：用电子束蒸发的方法制备ＮｉＯ／ＮｉＦｅＣｏ／Ｃｕ／ＮｉＦｅＣｏ自旋阀多层膜。通过磁场中退火得到好的偏置型自旋阀ＧＭＲ效应。通过对制备态以及磁场退火后样品的ＭＲ曲线的研究，讨论了交换耦合作用、单层磁性能以及层间耦合作用对材料ＧＭＲ效应的大小和磁场灵敏度的影响，得出提高交换耦合作用，改善单层磁性能和尽可能减小层间耦合将有利于得到高性能的偏置型自旋阀ＧＭＲ材料的结论。NiO/NiFeCo/Cu/NiFeCo spinvalve multilayers were fabricated by electrobeam evaporation and annealed in magnetic field.It was found that through annealing the multilayers showed better exchangebiased spinvalve GMR characters.The effects of the exchange coupling,the properties of the magnetic layers and the ferromagnetic coupling between the magnetic layers on the GMR effect and the sensitivity of the multilayers were discussed.It was concluded that the enhancement of the exchange coupling,the improvement of the soft magnetic properties of the magnetic layers and the decrease of the ferromagnetic coupling between the free layer and the pinned layer were important to get good exchange biased spinvalves.

关 键 词：自旋阀 交换耦合作用 巨磁电阻效应 多层膜 

分 类 号：O484.43[理学—固体物理]