Epitaxial Graphene Sensors for Detection of Small Magnetic Moments

Author

Panchal, Vishal ; Cox, David ; Yakimova, Rositza ; Kazakova, Olga

Author_Institution

Nat. Phys. Lab., Teddington, UK

Volume

49

Issue

1

fYear

2013

fDate

Jan. 2013

Firstpage

97

Lastpage

100

Abstract

Micron-sized Hall sensors made of epitaxial graphene grown on 4H-SiC(0001) have been fabricated and studied at room temperature using transport and noise spectrum measurements. We report detection of 1-μm Dynal bead with the magnetic moment of ~4×10⁸ μ_B, using a 2-μm epitaxial graphene device. A phase-sensitive AC-DC Hall magnetometry method was used to reliably detect the bead with a relatively large response of V_x^AC ~ 7 μV. Bead positioning was performed using a nanomanipulator inside of the FIB system. Long-term effect of the small dose of e-beam irradiation (~4 × 10¹⁴ e/cm²) on the performance of graphene Hall devices is reported.

Keywords

Hall effect devices; electron beam effects; elemental semiconductors; focused ion beam technology; graphene; magnetic epitaxial layers; magnetic moments; magnetic sensors; magnetic variables measurement; semiconductor epitaxial layers; semiconductor growth; C; Dynal bead detection; FIB system; SiC; bead positioning; e-beam irradiation dose; epitaxial graphene device; epitaxial graphene sensors; graphene Hall device performance; long-term effect; magnetic moment detection; micron-sized Hall sensors; nanomanipulator; noise spectrum measurement; phase-sensitive AC-DC Hall magnetometry method; size 1 mum; size 2 mum; temperature 293 K to 298 K; transport measurement; Epitaxial growth; Noise; Radiation effects; Temperature measurement; Temperature sensors; Dynal bead; Hall sensor; electron beam irradiation; epitaxial graphene; single particle detection;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2012.2218277

Filename

6392383