Dynamics of field-induced ordering processes in ferrofluids studied by polarised small-angle neutron scattering

被引：12
作者：
Wiedenmann, A.
Keiderling, U.
May, R. P.
Dewhurst, C.
机构：
[1] Hahn Meitner Inst Berlin GmbH, D-14109 Berlin, Germany
[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
来源：
PHYSICA B-CONDENSED MATTER | 2006年 / 385卷
关键词：
polarised neutrons; small-angle scattering; ferrofluids; field-induced ordering; time-dependent stroboscopic measurements;
D O I：
10.1016/j.physb.2006.05.149
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The relaxation of the local ordering of nanoparticles induced by an external magnetic field in a concentrated Cobalt ferrofluid was studied by stroboscopic polarised small-angle neutron scattering. Magnetic and nuclear correlations were found to decay exponentially within a characteristic time of few seconds. The local hexagonal particle arrangements with aligned moments transform gradually to uncorrelated segments of dipolar chains. The dynamics is influenced by dipole-dipole interactions. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：453 / 456
页数：4
相关论文
共 7 条
  • [1] HESS S, 1987, PHYS COMPLEX SUPRAMO, P631
  • [2] FIELD-INDUCED STRUCTURES IN FERROFLUID EMULSIONS
    LIU, J
    LAWRENCE, M
    WU, A
    IVEY, ML
    FLORES, GA
    JAVIER, K
    BIBETTE, J
    RICHARD, J
    [J]. PHYSICAL REVIEW LETTERS, 1995, 74 (14) : 2828 - 2831
  • [3] Magnetic relaxation of interacting Co clusters:: Crossover from two- to three-dimensional lattices -: art. no. 217205
    Luis, F
    Petroff, F
    Torres, JM
    García, LM
    Bartolomé, J
    Carrey, J
    Vaurès, A
    [J]. PHYSICAL REVIEW LETTERS, 2002, 88 (21) : 2172051 - 2172054
  • [4] Polarized SANS for probing magnetic nanostructures
    Wiedenmann, A
    [J]. PHYSICA B-CONDENSED MATTER, 2005, 356 (1-4) : 246 - 253
  • [5] Field-induced ordering phenomena in ferrofluids observed by small-angle neutron
    Wiedenmann, A
    Heinemann, A
    [J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2005, 289 : 58 - 61
  • [6] Field-induced pseudocrystalline ordering in concentrated ferrofluids
    Wiedenmann, A
    Hoell, A
    Kammel, M
    Boesecke, P
    [J]. PHYSICAL REVIEW E, 2003, 68 (03): : 10
  • [7] WIEDENMANN A, 2004, 709110 ILL
1