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首页> 外文期刊>Physica, B. Condensed Matter >Magnetization enhancement at low temperature due to surface ordering in Fe-Ni-B amorphous nanoparticles
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Magnetization enhancement at low temperature due to surface ordering in Fe-Ni-B amorphous nanoparticles

机译:Fe-Ni-B无定形纳米粒子中由于表面有序性导致的低温磁化增强

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摘要

We report magnetization measurements up to 5 T as a function of temperature from 5 to 300 K in an amorphous Fe-Ni-B system nanoparticle (average diameter similar to 3 nm). These nanoparticles were dispersed in a non-magnetic polymer matrix to minimize interparticle interactions and the results were contrasted with a concentrated powder sample. The saturation magnetization shows a sudden increase below 40 K. This behavior is observed in both the dispersed and the concentrated systems, being noticeably more pronounced in the first. This result can be explained considering that the large magnetic contribution at low T is due to the magnetic ordering of the particle surface. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 9]
机译:我们报告了在无定形的Fe-Ni-B系统纳米粒子(平均直径类似于3 nm)中,随温度从5到300 K的变化,磁化测量值高达5T。将这些纳米颗粒分散在非磁性聚合物基质中,以最大程度地减少颗粒间的相互作用,并将结果与​​浓缩的粉末样品进行对比。饱和磁化强度显示出突然增加到40 K以下。这种现象在分散系统和集中系统中都观察到,在第一个系统中更明显。可以考虑在低T下产生较大的磁性贡献是由于粒子表面的磁性排序而解释的结果。 (C)2002 Elsevier Science B.V.保留所有权利。 [参考:9]

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