L10 FePt–C Nanogranular Perpendicular Anisotropy Films with Narrow Size Distribution
L10 FePt–C Nanogranular Perpendicular Anisotropy Films with Narrow Size Distribution
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DOI：
10.1143/apex.1.101301
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发表时间：
2008-09
影响因子：
2.3
通讯作者：
A. Perumal;Y. Takahashi;K. Hono
中科院分区：
文献类型：
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作者：
A. Perumal;Y. Takahashi;K. Hono
本文报道了在氧化硅衬底上制备的具有（100）织构MgO中间层的L10 FePt-C纳米颗粒垂直各向异性薄膜的研究。在FePt（4 nm）薄膜中加入少量的C（<12%）导致形成互连的FePt颗粒，而较高的C加入导致形成具有c轴织构的良好隔离的L10 FePt纳米颗粒。通过调整FePt的厚度，可以将FePt的粒径减小到5.5nm，粒径分布为2.3nm。周向极化率在8 - 15 kOe之间可控，矩形度高。这些结果表明，FePt-C系统可以实现适用于磁密度垂直记录介质的纳米颗粒结构。
We report the study of L10 FePt–C nanogranular perpendicular anisotropy films fabricated on oxidized Si substrates with a (100) textured MgO intermediate layer. The addition of a small amount of C (<12%) to a FePt (4 nm) film results in the formation of interconnected FePt particles, while a higher C addition leads to the formation of well-isolated L10 FePt nanoparticles with a c-axis texture. The FePt particle size can be reduced to 5.5 nm with a size distribution of 2.3 nm in variance by adjusting FePt thickness. Perpendicular coercivity is controllable between 8 and 15 kOe with high squareness. These results demonstrate that the FePt–C system can accomplish a nanogranular structure suitable for ultrahigh density perpendicular recording media.