Preparation and properties of ferromagnetic FePt dispersion
Preparation and properties of ferromagnetic FePt dispersion
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DOI：
10.1016/j.jmmm.2004.11.002
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发表时间：
2005-03
影响因子：
2.7
通讯作者：
K. Sato;B. Jeyadevan;K. Tohji
中科院分区：
文献类型：
--
作者：
K. Sato;B. Jeyadevan;K. Tohji
以四甘醇为溶剂，在不同温度下，通过乙酰丙酮酸铂和乙酰丙酮酸铁的共还原反应制备了FePt纳米粒子。在高于573 K的温度下，所合成的FePt纳米颗粒的X射线衍射图显示出（001）和（110）超晶格反射。TEM-EDX研究表明，平均粒径为5 nm，具有接近等原子组成。室温下的饱和磁化强度和矫顽力分别为50 emu/g和2.1kOe。在室温下的约32 kOe的高各向异性场和磁有序揭示了高度各向异性的L10相的存在。这些颗粒部分分散在有机溶剂中使用油胺作为表面活性剂。分散的FePt纳米颗粒将在未来的技术应用中是有用的。
FePt nanoparticles were prepared via the coreduction of platinum and iron acetyl acetonate precursors in tetraethylene glycol at various temperatures. The X-ray diffractogram of the as-synthesized FePt nanoparticles at temperatures above 573K exhibited (001) and (110) superlattice reflections. TEM–EDX studies revealed that the average particle diameter was 5nm with nearly equiatomic composition. The saturation magnetization and coercivity at room temperature (RT) were found to be 50emu/g and 2.1kOe, respectively. The high anisotropy field of about 32kOe and magnetic ordering at RT revealed the presence of the highly anisotropic L10phase. These particles were partially dispersed in an organic solvent using oleyl amine as surfactant. The dispersed FePt nanoparticles will be useful in future technological applications.