Fabrication and characterization of ordered FePt nanoparticles
Fabrication and characterization of ordered FePt nanoparticles
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有序 FePt 纳米粒子的制备和表征
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
D. Weller
中科院分区：
文献类型：
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作者：
Y. Huang;Yong Zhang;G. Hadjipanayis;D. Weller
通过在450 °C以上的温度下将FePt和C直接沉积到加热的基底上，获得了具有独特磁性的有序FePt纳米颗粒。 通过调节FePt和C靶的溅射时间，将FePt颗粒尺寸控制在几纳米至20纳米的范围内。FePt纳米粒子（小于3 nm）在室温下表现出超顺磁性。然而，较大的颗粒在室温下显示出巨大的折射率（平均尺寸分别为8和15 nm的颗粒分别为23和34 kOe）。当FePt与C的比例一定时，薄膜表现出很强的垂直各向异性，这对高密度记录介质是有利的。
Ordered FePt nanoparticles with unique magnetic properties were obtained by direct deposition of FePt and C onto heated substrates at temperature above 450 °C. The FePt particle sizes were controlled in the range from a few nanometers to 20 nm by adjusting the sputtering time from both the FePt and C targets. The tiny FePt nanoparticles (less than 3 nm) showed superparamagnetic behavior at room temperature. However, larger particles showed huge coercivities at room temperature (23 and 34 kOe for particles with average sizes of around 8 and 15 nm, respectively). For a certain FePt to C ratio, the films can show strong perpendicular anisotropy which is favorable for high density recording media.