Main Page
About the Journal
Subscription information

Current Issue
Tables of Contents
Author Index


Dynamics of a superparamagnetic microparticle chain in an oscillating magnetic field: effects of field frequency

Ching-Yao Chen1 - He-Ching Lin2 - Che-Jui Teng1 - Yan-Hom Li3

1 Department of Mechanical Engineering, National Chiao Tung University, Hsinchu City, Taiwan R.O.C.
2 Department of Mechanical Engineering, Air Force Institute of Technology, Kaohsiung, Taiwan R.O.C.
3 Department of Mechanical and Aerospace Engineering, National Defense University, Taoyuan, Taiwan R.O.C.

Dynamics of an oscillating chain consisting of several magnetic microparticles and driven by oscillating magnetic fields with different frequencies are discussed. Because of a shorter driving time by the external field with a higher field frequency, the oscillating amplitude of the chain reduces. On the other hand, the higher field frequency leads to a faster local angular velocity. These two effects result in inconsistent behavior of the structural stability of the chain, so that the chain ruptures in a field of intermediate frequency. A dimensionless parameter of the reduced frequency is proposed to generally describe the monotonic decrease of the normalized amplitude. The phenomenon of trajectory shift triggered by the higher frequency field is also demonstrated. Figs 7, Refs 37.

Magnetohydrodynamics 53, No. 3, 449-460, 2017 [PDF, 0.69 Mb]

Copyright: Institute of Physics, University of Latvia
Electronic edition ISSN 1574-0579
Printed edition ISSN 0024-998X