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

Journal Article · Mon Apr 13 00:00:00 EDT 2009 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.3122142· OSTI ID:1040092

Lee, W; Kim, K; Joo, S; Kim, S U; Rhie, K; Hong, J; Shin, K-H; and Kim, K H

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.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE NA OFFICE OF NONPROLIFERATION AND VERIFICATION RESEARCH AND DEVELOPMENT
• DOE Contract Number: DE-AC02-98CH10886
• OSTI ID: 1040092
• Report Number(s): BNL-90251-2009-JA; APPLAB; R&D Project: 10407; 10407; NN20010000; TRN: US1202303
• Journal Information: Applied Physics Letters, Vol. 94, Issue 15; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
HALL EFFECT
MAGNETIC MATERIALS
MICROSPHERES
MINIATURIZATION
NUMERICAL ANALYSIS
SENSORS
SIMULATION
TEMPERATURE DEPENDENCE