Using Symmetry Breaking for Directed Transport of Paramagnetic Colloids on Garnet Films

被引：2

作者：

Aliaskarisohi, S. ^{[1
]}

Johansen, T. H. ^{[2
]}

Fischer, Th M. ^{[1
]}

机构：

[1] Univ Bayreuth, Inst Expt Phys, D-95440 Bayreuth, Germany

[2] Univ Oslo, Dept Phys, N-0316 Oslo, Norway

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2011年 / 115卷 / 10期

关键词：

RATCHET;

D O I：

10.1021/jp1118585

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：

The transport behavior of paramagnetic particles on top of a ferrimagnetic garnet film is investigated in a modulated external magnetic field. Broken symmetries are required to direct the transport of the particles. We provide such symmetry breaking by tilting the external field modulation with respect to the normal direction of the garnet film and by the intrinsic geometrical symmetry breaking of the garnet film magnetic pattern. The interplay of both symmetry breaking mechanisms causes a rich variety in transport behavior and direction. We corroborate our experimental transport directions by comparing experimental with theoretical transport phase diagrams. Directing the transport of paramagnetic colloids will be useful when they are loaded with biomedical cargo on a magnetic lab-on-a-chip device.

引用

页码：2243 / 2247

页数：5

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