Preparation and magnetic characteristics of size-monodispersed Fe-Co alloy cluster assemblies

被引：15
作者：
Peng, D. L. [1 ]
Chen, Y. [1 ]
She, H. [1 ]
Katoh, R. [2 ]
Sumiyama, K. [2 ]
机构：
[1] Xiamen Univ, Coll Mat, Dept Mat Sci & Engn, Xiamen 361005, Peoples R China
[2] Nagoya Inst Technol, Dept Mat Sci & Engn, Nagoya, Aichi 4668555, Japan
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 469卷 / 1-2期
基金：
中国国家自然科学基金;
关键词：
Fe-Co alloy clusters; Magnetic properties; Plasma-gas-condensation-type cluster deposition; COBALT NANOCRYSTALS; IRON NANOPARTICLES; NANOSTRUCTURES; BEHAVIOR; SPIN;
D O I：
10.1016/j.jallcom.2008.01.087
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Size-monodispersed Fe70Co30 alloy clusters were obtained by a plasma-gas-condensation (PGC)-type cluster deposition method. The structural and magnetic characteristics of Fe70Co30 alloy cluster-assembled films were systematically studied. The as-obtained Fe70Co30 clusters have a body-centered-cubic (bcc) alpha-(Fe,Co) structure and their average sizes can be adjusted from 8 to 14 nm. Based upon the temperature dependence of magnetic coercivity, we estimated the effective magnetic anisotropy constant, K-eff, and magnetic exchange length, L-ex, as a function of initial mean cluster diameter, d, in the Fe70Co30 cluster-assembled films which were formed by soft landing of the clusters and have a low cluster-packing fraction of about 30%. The estimated K-eff and L-ex values depend strongly on the d values of the cluster-assembled films: K-eff decreases while L-ex increases with decreasing d of the Fe70Co30 Clusters. For the Fe70Co30 cluster-assembled films with d = 14.3 nm, the L-ex value is close to the initial mean cluster size, whereas for the films with d = 9.7 nm the L-ex value is about two times of the initial mean cluster size. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：276 / 281
页数：6
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