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首页> 外文期刊>International journal of nanoscience >SYNTHESIS AND PROPERTIES OF MAGNETIC COBALT-SAMARIUM NANOCLUSTER ASSEMBLIES
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SYNTHESIS AND PROPERTIES OF MAGNETIC COBALT-SAMARIUM NANOCLUSTER ASSEMBLIES

机译：磁性钴-MAR纳米簇的合成与性能

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摘要

Bimetallic cobalt-samarium nanoparticles axe prepared in the gas phase using a combined laser vaporization-rare gas condensation source and subsequently deposited on. various substrates or embedded in non-magnetic metallic matrix using the Low Energy Cluster Beam Deposition technique (LECBD). Structural and magnetic characterizations from assemblies of isolated clusters, reveal Co-Sm clusters with a mean diameter around 3.5 nm, and a loss of magnetization compared to the bulk SmCo{sub}5 phase, probably due to an amorphous state associated to a segregation of the samarium atoms at the cluster surface. Annealing in ultra high vacuum up to 820 K considerably improves the crystallinity and the homogeneity of the mixed clusters leading to a significant increase of the magnetic anisotropy and consequently of the blocking temperature, as large as 400 K, without significantly increasing the mean size (around 6 nm). Such results seem promising for applications to high-density memory devices and spintronics.
机译：使用组合的激光汽化稀有气体冷凝源在气相中制备双金属钴-纳米粒子，然后沉积在其上。使用低能簇束沉积技术（LECBD）可以将各种基底或嵌入非磁性金属基质中。来自孤立簇的组装的结构和磁性表征显示，与整体SmCo {sub} 5相相比，Co-Sm簇的平均直径约为3.5 nm，并且磁化强度损失，这可能是由于与C的偏析相关的非晶态所致。团簇表面的sa原子。在高达820 K的超高真空中进行退火可显着提高混合团簇的结晶度和均匀性，从而导致磁各向异性（因此高达400 K）的显着增加，而不会显着增加平均尺寸（大约6 nm）。这样的结果对于应用于高密度存储器件和自旋电子器件似乎是有希望的。

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