Low-temperature ordering of (001) granular FePt films by inserting ultrathin SiO2 layers
Low-temperature ordering of (001) granular FePt films by inserting ultrathin SiO2 layers
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DOI：
10.1063/1.2770652
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发表时间：
2007-08
影响因子：
4
通讯作者：
Yun-chung Wu;Liang-Wei Wang;C. Lai
中科院分区：
文献类型：
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作者：
Yun-chung Wu;Liang-Wei Wang;C. Lai
通过在玻璃衬底上沉积原子尺度的Fe / Pt / SiO2多层膜（MLs）并在350℃下退火，获得了取向为（001）、晶粒间距为5.14nm的L10 FePt-SiO2颗粒薄膜。获得了7700Oe的大面外矫顽力和0.83的高有序系数。交替的原子尺度沉积促进了（001）织构的形成。此外，由于SiO2层的表面能较低，在退火过程中SiO2倾向于扩散到FePt的晶界，这可能会加速Fe和Pt原子的扩散，导致低温有序。
L10 granular FePt–SiO2 films with a (001) preferred orientation and well-separated grains of 5.14nm were obtained by depositing atomic-scale Fe∕Pt∕SiO2 multilayers (MLs) on glass substrates and subsequently annealing MLs at a temperature of 350°C. Large out-of-plane coercivity of 7700Oe and a high ordering factor of 0.83 were achieved. Alternate atomic-scale depositions promoted the formation of (001) textures. Furthermore, because of the low surface energy of SiO2 layers, SiO2 tended to diffuse into grain boundaries of FePt during annealing, which may accelerate diffusion of Fe and Pt atoms, resulting in the low-temperature ordering.