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用高分辨电子显微学及平行电子能量损失谱方法研究了Ni80Fe20Cu基磁性多层膜和自旋阀的显微结构。高分辨像显示,磁性多层膜及自旋阀均具有沿薄膜生长方向的柱晶结构。Ni,Fe,Cu和Mn元素的成分分布图显示,柱晶内仍保持完整的层状结构。沿薄膜生长方向的自旋阀元素分布曲线分析表明,NiFe层中的Ni元素沿柱晶晶界向相邻Cu层扩散。讨论了这些低维磁电子学材料的显微结构对磁输运性能的影响。
The microstructure of Ni80Fe20Cu magnetic multilayers and spin-valves was studied by high-resolution electron microscopy and parallel electron energy loss spectroscopy. High-resolution images show that the magnetic multilayer film and the spin-on valve have a columnar structure along the film growth direction. The compositional distribution of Ni, Fe, Cu and Mn elements shows that the columnar crystals still maintain a complete layered structure. The analysis of the spin-valve element distribution curves along the film growth direction shows that the Ni element in the NiFe layer diffuses to the adjacent Cu layer along the column grain boundaries. The effects of the microstructure of these low-dimensional magnetoelectronic materials on the magnetic transport properties are discussed.