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首页> 外文会议>Symposium on Nanophase and Nanocomposite Materials III held November 29-December 2, 1999, Boston, Massachusetts, U.S.A. >Microstructural and magnetic properties on graphitic encapsulated Ni nanocrystals and pure Ni nanoparticles with NiO layer
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Microstructural and magnetic properties on graphitic encapsulated Ni nanocrystals and pure Ni nanoparticles with NiO layer

机译：石墨包裹的Ni纳米晶和具有NiO层的纯Ni纳米颗粒的微观结构和磁性

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摘要

Two kinds of different nickel nanoparticles with distinct morphological properties, Ni(C) and Ni(O), are studied. Magnetization measurements for the assembly of two kinds of Ni nanoparticles show, a larger coercivity and remanence as well as the deviation between the zero field cooling (ZFC) and the field cooling (FC) magnetization have been observed in the Ni(O) particles. This deviation may be explained as a typical cluster glass-like behavior due to ferromagnetic interaction among the assembly of Ni(O) particles. However, Ni(C) particles exhibit superparamagnetism at room temperature. The average blocking temperature (T_B) is determined to around 115K. We also observe gradual decrease in saturation magnetization, which is attributed to the nanocrystalline nature of the encapsulated particles.
机译：研究了两种具有不同形态特性的不同镍纳米粒子，Ni（C）和Ni（O）。两种镍纳米粒子组装的磁化测量结果表明，在Ni（O）粒子中观察到较大的矫顽力和剩磁以及零磁场冷却（ZFC）和磁场冷却（FC）磁化之间的偏差。可以将这种偏差解释为由于Ni（O）粒子组件之间的铁磁相互作用而导致的典型的团簇玻璃状行为。但是，Ni（C）颗粒在室温下表现出超顺磁性。平均阻塞温度（T_B）确定为约115K。我们还观察到饱和磁化强度的逐渐降低，这归因于被包封颗粒的纳米晶体性质。

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