期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 300, 期 2, 页码 418-426出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2005.05.031
关键词
magnetic microsystems; separation; microelectromagnets; magnetophoresis
We demonstrate a simple scheme for fabrication of microelectromagnets consisting of planar spiral coils semi-encapsulated in soft magnetic yokes using conventional microfabrication techniques. The microelectromagnets are suitable for applications operating at frequencies below 250kHz. Conventional fabrication schemes for planar microelectromagnets typically rely on five mask steps. We allow the current to flow in the soft magnetic yoke and thereby two mask steps are eliminated. We have characterized the electromagnets electrically, the results agree well with theory, and the implications arising from current flowing in the magnetic yoke are discussed. We have integrated the microelectromagnets with microfluidic channels, and demonstrated separation of commercially available magnetic beads from a fluid in a microfluidic system, i.e. a lab-on-a-chip system. (c) 2005 Elsevier B.V. All rights reserved.
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