The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.
J Microsc. 2009 Nov;236(2):94-9. doi: 10.1111/j.1365-2818.2009.03234.x.
Finely dispersed hard magnetic L1o-FePtCu nanoparticles with 100 orientation were directly synthesized by RF-sputtering on NaCl substrate at a temperature of 613 K. The maximum coercivity of the particles was 1.4 kOe (at RT). Degrees of atomic long-range order (LRO) for the L1o-FePtCu nanoparticles with different sizes were obtained using nanobeam electron diffraction technique. The decrease of LRO parameter became remarkable when the size became below 8 nm. The coercivity value also decreased with decreasing the particle size. The relation between the LRO parameter decrease and the coercivity decrease with particle size was discussed.
在 613 K 的温度下，通过射频溅射直接在 NaCl 衬底上合成了具有 100 取向的精细分散硬磁 L1o-FePtCu 纳米粒子。粒子的最大矫顽力为 1.4 kOe（室温）。使用纳米束电子衍射技术获得了不同尺寸的 L1o-FePtCu 纳米粒子的原子长程有序（LRO）程度。当尺寸小于 8nm 时，LRO 参数的降低变得显著。矫顽力值也随粒径的减小而减小。讨论了 LRO 参数降低与矫顽力随粒径减小的关系。
