Microelectromagnet for magnetic manipulation in lab-on-a-chip systems

Kristian Smistrup, P.T. Tang, Ole Hansen, Mikkel Fougt Hansen

Research output: Contribution to journalJournal articleResearchpeer-review


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 250 kHz. 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.
Original languageEnglish
JournalJournal of Magnetism and Magnetic Materials
Issue number2
Pages (from-to)418-426
Publication statusPublished - 2006


  • Magnetic microsystems
  • Separation
  • Microelectromagnets
  • Magnetophoresis


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