Detection of ferromagnetic nanowires using GMR sensors

Author

Anguelouch, A. ; Reich, D.H. ; Chien, C.L. ; Tondra, M.

Author_Institution

Dept. of Phys. & Astron., Johns Hopkins Univ., Baltimore, MD, USA

Volume

40

Issue

4

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

2997

Lastpage

2999

Abstract

The detection of ferromagnetic Ni nanowires with integrated giant magnetoresistance sensors is investigated for possible use in magnetic biosensing. Single nanowires with magnetic moments at least as small as 1.5×10^-10 emu are readily detectable in a zero-applied field. The signal is a linear function of the number of nanowires, making the sensor suitable for use as a particle counter. With increasing wire length, the magnitude of the sensor signal increases at first and then appears to saturate. The signal shows significant dependence on the angle of the wire with respect to the sensing axis and changes sign when the wire´s moment is antiparallel to the sensing direction.

Keywords

biomedical transducers; ferromagnetic materials; giant magnetoresistance; magnetic sensors; nanowires; nickel; GMR sensors; biomedical transducers; ferromagnetic Ni nanowires; ferromagnetic nanowires detection; integrated giant magnetoresistance sensors; magnetic biosensing; magnetic moments; nanotechnology; nickel; particle counter; sensing axis; sensor signal; wire length; zero-applied field; Biosensors; DNA; Giant magnetoresistance; Magnetic moments; Magnetic sensors; Nanowires; Nickel; Optical detectors; Saturation magnetization; Wires; Biomedical transducers; GMR; giant magnetoresistance; nanotechnology; nickel;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2004.829316

Filename

1325711