skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Single particle detection: Phase control in submicron Hall sensors

Abstract

We present a phase-sensitive ac-dc Hall magnetometry method which allows a clear and reliable separation of real and parasitic magnetic signals of a very small magnitude. High-sensitivity semiconductor-based Hall crosses are generally accepted as a preferential solution for non-invasive detection of superparamagnetic nanobeads used in molecular biology, nanomedicine, and nanochemistry. However, detection of such small beads is often hindered by inductive pick-up and other spurious signals. The present work demonstrates an unambiguous experimental route for detection of small magnetic moments and provides a simple theoretical background for it. The reliability of the method has been tested for a variety of InSb Hall sensors in the range 600 nm-5 {mu}m. Complete characterization of empty devices, involving Hall coefficients and noise measurements, has been performed and detection of a single FePt bead with diameter of 140 nm and magnetic moment of {mu}{approx_equal}10{sup 8} {mu}{sub B} has been achieved with a 600 nm-wide sensor.

Authors:
; ; ;  [1]
  1. National Physical Laboratory, Teddington TW11 0LW (United Kingdom)
Publication Date:
OSTI Identifier:
21537938
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 108; Journal Issue: 10; Other Information: DOI: 10.1063/1.3514097; (c) 2010 American Institute of Physics; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DETECTION; EQUIPMENT; HALL EFFECT; INDIUM ANTIMONIDES; MAGNETIC MOMENTS; MAGNETOMETERS; NOISE; PARTICLES; RELIABILITY; SEMICONDUCTOR MATERIALS; SENSITIVITY; SENSORS; SUPERPARAMAGNETISM; ANTIMONIDES; ANTIMONY COMPOUNDS; INDIUM COMPOUNDS; MAGNETISM; MATERIALS; MEASURING INSTRUMENTS; PNICTIDES

Citation Formats

Di Michele, Lorenzo, Shelly, Connor, Gallop, John, and Kazakova, Olga. Single particle detection: Phase control in submicron Hall sensors. United States: N. p., 2010. Web. doi:10.1063/1.3514097.
Di Michele, Lorenzo, Shelly, Connor, Gallop, John, & Kazakova, Olga. Single particle detection: Phase control in submicron Hall sensors. United States. https://doi.org/10.1063/1.3514097
Di Michele, Lorenzo, Shelly, Connor, Gallop, John, and Kazakova, Olga. 2010. "Single particle detection: Phase control in submicron Hall sensors". United States. https://doi.org/10.1063/1.3514097.
@article{osti_21537938,
title = {Single particle detection: Phase control in submicron Hall sensors},
author = {Di Michele, Lorenzo and Shelly, Connor and Gallop, John and Kazakova, Olga},
abstractNote = {We present a phase-sensitive ac-dc Hall magnetometry method which allows a clear and reliable separation of real and parasitic magnetic signals of a very small magnitude. High-sensitivity semiconductor-based Hall crosses are generally accepted as a preferential solution for non-invasive detection of superparamagnetic nanobeads used in molecular biology, nanomedicine, and nanochemistry. However, detection of such small beads is often hindered by inductive pick-up and other spurious signals. The present work demonstrates an unambiguous experimental route for detection of small magnetic moments and provides a simple theoretical background for it. The reliability of the method has been tested for a variety of InSb Hall sensors in the range 600 nm-5 {mu}m. Complete characterization of empty devices, involving Hall coefficients and noise measurements, has been performed and detection of a single FePt bead with diameter of 140 nm and magnetic moment of {mu}{approx_equal}10{sup 8} {mu}{sub B} has been achieved with a 600 nm-wide sensor.},
doi = {10.1063/1.3514097},
url = {https://www.osti.gov/biblio/21537938}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 10,
volume = 108,
place = {United States},
year = {Mon Nov 15 00:00:00 EST 2010},
month = {Mon Nov 15 00:00:00 EST 2010}
}