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Epitaxial graphene sensors for detection of small magnetic moments.

Panchal, V; Cox, D; Yakimova, R*; Kazakova, O (2013) Epitaxial graphene sensors for detection of small magnetic moments. IEEE Trans. Magn., 49 (1). pp. 97-100.

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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-um Dynal bead with the magnetic moment of ~4×10^8 uB, using a 2-um epitaxial graphene device. A phase-sensitive AC-DC Hall magnetometry method was used to reliably detect the bead with a relatively large response of Vx ~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 (~4x10^14 e/cm^2) on the performance of graphene Hall devices is reported.

Item Type: Article
Keywords: Hall sensor, epitaxial graphene, Dynal bead, single particle detection, electron beam irradiation
Subjects: Nanoscience
Nanoscience > Nano-Dimensional
Identification number/DOI: 10.1109/TMAG.2012.2218277
Last Modified: 07 Jul 2020 09:36
URI: http://eprintspublications.npl.co.uk/id/eprint/5707

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