Magnetic bead counter using a micro-Hall sensor for biological applications

Wonhyun Lee, Sungjung Joo, Sun Ung Kim, Kungwon Rhie, Jinki Hong, Kyung Ho Shin, Ki Hyun Kim

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


Micro-Hall sensors have been fabricated, and various numbers of micron-size magnetic beads have been placed within the sensor area. The Hall resistances measured at room temperature are found to be proportional to the number of the beads, and are in good agreement with the numerically simulated results presented in this study. Our sensors are designed to measure the number of beads between zero and full-scale signals for a given number range of interest. The effects of miniaturizing the beads and sensors to nanoscale are also discussed.

Original languageEnglish
Article number153903
JournalApplied Physics Letters
Issue number15
Publication statusPublished - 2009
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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