Detection of single magnetic bead for biological applications using an InAs quantum-well micro-Hall sensor

Goran Mihajlović, Peng Xiong, Stephan Von Molnár, Keita Ohtani, Hideo Ohno, Mark Field, Gerard J. Sullivan

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)

Abstract

Room-temperature detection of a single commercial superparamagnetic bead (1.2 μm in diameter) suitable for biological applications has been realized using an InAs quantum-well micro-Hall sensor. The detection was demonstrated using phase-sensitive detection on a single Hall cross as well as in a Hall gradiometry setup. The high signal to noise ratio, obtained in both configurations, promises detection of single nanometer-size particles by further miniaturization of the device to submicron dimensions.

Original languageEnglish
Article number112502
JournalApplied Physics Letters
Volume87
Issue number11
DOIs
Publication statusPublished - 2005 Sep 12

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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