NiFe/Co/Cu/Co结构自旋阀GMR效应及Co夹层的影响研究

Influence of Inserted Co Layer on GMR Effect of NiFe/Co/Cu/Co

用射频磁控溅射发射法成功制备ＮｉＦｅ／Ｃｕ／Ｃｏ自旋阀多层膜材料，改变Ｃｕ层的厚度，研究材料的ＧＭＲ效应与Ｃｕ层厚度的关系，结果表明Ｃｕ为２．５ｎｍ时样品的ＭＲ值最大，其磁电阻效应ＭＲ可达１．６％。在ＮｉＦｅ和Ｃｕ之间插入一Ｃｏ薄夹层，通过对不同厚度Ｃｏ夹层的样品的ＭＲ曲线及磁滞回线的研究，讨论了Ｃｏ夹层对样品磁电阻的影响并分析了原因。结果表明插入适当的Ｃｏ层将提高材料的磁电阻效应，可达２．５％。

We fabricated successfully NiFe/Cu/Co spinvalves by RF magnetron sputtering.The change of MR ration with thickness of Cu was studied.We found that MR ratio was the largest when thickness of Cu was 2.5nm. The maximum MR ratio could reach 1.6%.We inserted a thin Co layer between NiFe and Cu, studied GMR effects and magnetic properties of spin valves with different thickness of inserted Co layer.It was found that the inserted Co layer would affect GMR effects of spinvalves.That inserting a proper thickness of Co would enhance GMR effect of the sandwichs was the conclusion.The causes of effects of Co inserted layer on GMR effect of mateials were discussed.The maximum MR ratio could reach 2.5%.