Break-up of dipolar rings under an external magnetic field

被引:10
作者
Kun, F
Pál, KF
Wen, WJ
Tu, KN
机构
[1] Univ Debrecen, Dept Theoret Phys, H-4010 Debrecen, Hungary
[2] Univ Stuttgart, Inst Comp Applicat, ICAI, D-70569 Stuttgart, Germany
[3] Hungarian Acad Sci, Inst Nucl Res, ATOMKI, H-4001 Debrecen, Hungary
[4] Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China
[5] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
关键词
magnetic microspheres; aggregation; rings; break-up;
D O I
10.1016/S0375-9601(00)00677-0
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
An experimental and theoretical study of the deformation and break-up process of rings, formed by magnetic microspheres, under the application of an external magnetic field is reported in this Letter. When the external magnetic field is applied parallel to the plane of the rings, we found that the break-up process has three different outcomes depending on the way of application and time history of the external held: (a) deformation into a compact set of dipoles with a triangular lattice structure, (b) opening into a single chain, and (c) break-up into two chains with various relative sizes. A thorough theoretical investigation of the breakup process has been carried out based on computer simulations, taking into account solely the dipole-dipole and dipole-external field interactions, without thermal noise. The experimental results and the simulations are in good agreement. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:287 / 293
页数:7
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