Characterization of single magnetic particles with InAs quantum-well Hall devices

Landry, G.; Miller, M.M.; Bennett, B.R.; Johnson, M.; Smolyaninova, V.
November 2004
Applied Physics Letters;11/15/2004, Vol. 85 Issue 20, p4693
Academic Journal
We have measured the magnetic dipolar field from individual micron-sized spherical ferromagnetic particles. The particles were positioned using an atomic force microscope and measured using submicron Hall sensors fabricated from an InAs single-quantum-well heterostructure with lateral dimensions of 0.5-2.5 µm. The magnetic moment of individual particles has been measured, verifying their dipolar moment. We also demonstrate a scaling rule for the detection of individual particles which is relevant to the design of biosensors.


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