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通过调整Mn的成分 ,系统地研究了Ni81 Fe1 9 Ni1 0 0 -xMnx 双层膜的磁学性质 ,特别是交换偏置场 (Hex)的变化 .当Ni1 0 0 -xMnx 中Mn的原子百分比在 5 3 4 %到 6 0 0 %之间时 ,对于 15 0nm的Ni81 Fe1 9,得到了最大的交换偏置场17 5kA m ,同时由于Mn对Ni81 Fe1 9层的扩散所造成的磁矩的降低小于 2 0 % ;高角x射线衍射证明Ni1 0 0 -xMnx 的晶格常数随着Mn成分的改变而变化 ,Mn含量越多 ,其晶格常数越大 ;制备态Ni1 0 0 -xMnx 膜晶格常数与θ相NiMn膜晶格常数的接近程度与NiMn膜θ相形成的容易程度相对应 .也研究了交换偏置场随着Ni1 0 0 -xMnx 厚度的变化 ,第一次得到了当Ni1 0 0 -xMnx 中Mn的原子百分比为 70 6 %时 ,Ni81 Fe1 9(15 0nm) Ni1 0 0 -xMnx(9 0nm)双层膜在经过 2 4 0℃ ,5h退火后 ,可以有 8 0kA m的交换偏置场 ,此时铁磁层磁矩的大小几乎不变 .
By adjusting the composition of Mn, the magnetic properties, especially the change of exchange bias field (Hex), of Ni81 Fe1 9 Ni1 0 0 -xMnx bilayer films have been systematically investigated. When the atomic percentage of Mn in Ni1 0 0-x Mn x is 5 3 4% to 600%, the maximum exchange bias field 17 5 kA m was obtained for 150 nm Ni81 Fe1 9, and the magnetic moment due to the diffusion of Mn to Ni 81 Fe1 9 layer was reduced Less than 20%. The high-angle x-ray diffraction showed that the lattice constant of Ni1 0 0 -xMnx changed with the change of Mn composition, and the more the Mn content, the larger the lattice constant. The Ni1 0 0 -xMnx film lattice The closeness between the constants and the lattice constants of the θ phase NiMn films corresponds to the ease of formation of the θ phase of the NiMn films.The exchange bias field is also studied as the Ni1 0 0-x Mnx thickness changes for the first time as Ni1 0 When the atomic percentage of Mn in 0-x Mn x is 70 6%, Ni 81 Fe 1 9 (150 nm) Ni 1 O 0-x Mn x (90 nm) bilayers can anneal at 240 ℃ for 5h, Exchanging the bias field, the magnitude of the ferromagnetic moment is almost unchanged.