FePt-C nanogranular films for perpendicular magnetic recording
FePt-C nanogranular films for perpendicular magnetic recording
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DOI：
10.1063/1.3075986
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发表时间：
2009-03
影响因子：
3.2
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
我们报道了L10有序FePt-C纳米颗粒垂直各向异性薄膜和由8 nm厚的FePt-C硬磁层覆盖2 nm厚的软磁层（CoFe和FePt-C）组成的介质的研究。所有薄膜都是在氧化硅衬底上制备的，其中有厚度为10 nm的（100）多晶MgO中间层。在MgO层上溅射Fe、Pt和C，形成了具有强C轴织构的L10有序FePt纳米颗粒膜，FePt平均粒径约为5 nm，粒径分布窄，标准差为1.4 nm。垂直矫顽力在7 ~ 12克之间可控。薄膜的矫顽力和饱和场分别降低了55%和38%。本研究表明，FePt-C体系在超高密度垂直记录介质中实现了合适的纳米颗粒结构和磁性能。
We report the study of L10 ordered FePt-C nanogranular perpendicular anisotropy films and a media consisting of an 8 nm thick FePt-C hard magnetic layer covered with a 2 nm thick soft magnetic layer (CoFe and FePt-C). All the films were fabricated on oxidized Si substrates with a (100) textured polycrystalline MgO intermediate layer of 10 nm in thickness. Cosputtering of Fe, Pt, and C on the MgO layer results the formation of L10 ordered FePt nanogranular films with a strong c-axis texture and the average FePt particle size of about 5 nm with a narrow particle size distribution of 1.4 nm in standard deviation. Perpendicular coercivity is controllable between 7 and 12 kOe. The coercivity and the saturation field of the FePt-C granular films can be reduced by 55% and 38%, respectively, with the capping of thin soft magnetic layer. This study demonstrates that the FePt-C system accomplishes suitable nanogranular structures and magnetic properties for ultrahigh-density perpendicular recording media.