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
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
相关论文
共 33 条
  • [11] CRITICAL SIZE AND NUCLEATION FIELD OF IDEAL FERROMAGNETIC PARTICLES
    FREI, EH
    SHTRIKMAN, S
    TREVES, D
    [J]. PHYSICAL REVIEW, 1957, 106 (03): : 446 - 454
  • [12] Structure, composition and magnetic properties of size-selected FeCo alloy clusters on surfaces
    Getzlaff, M
    Bansmann, J
    Bulut, F
    Gebhardt, RK
    Kleibert, A
    Meiwes-Broer, KH
    [J]. APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 2006, 82 (01): : 95 - 101
  • [13] NANOCRYSTALLINE MATERIALS
    BIRRINGER, R
    [J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1989, 117 : 33 - 43
  • [14] THIN-FILMS FROM ENERGETIC CLUSTER IMPACT - A FEASIBILITY STUDY
    HABERLAND, H
    KARRAIS, M
    MALL, M
    THURNER, Y
    [J]. JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, 1992, 10 (05): : 3266 - 3271
  • [16] GRAIN-SIZE DEPENDENCE OF COERCIVITY AND PERMEABILITY IN NANOCRYSTALLINE FERROMAGNETS
    HERZER, G
    [J]. IEEE TRANSACTIONS ON MAGNETICS, 1990, 26 (05) : 1397 - 1402
  • [17] Magnetic properties of dipolar interacting single-domain particles
    Kechrakos, D
    Trohidou, KN
    [J]. PHYSICAL REVIEW B, 1998, 58 (18) : 12169 - 12177
  • [18] Structure and magnetic moments of mass-filtered deposited nanoparticles
    Kleibert, A.
    Passig, J.
    Meiwes-Broer, K.-H.
    Getzlaff, M.
    Bansmann, J.
    [J]. JOURNAL OF APPLIED PHYSICS, 2007, 101 (11)
  • [19] Synthesis of nanostructured materials by mechanical milling: Problems and opportunities
    Koch, CC
    [J]. NANOSTRUCTURED MATERIALS, 1997, 9 (1-8): : 13 - 22
  • [20] Magnetic nanoparticles
    Kodama, RH
    [J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1999, 200 (1-3) : 359 - 372