This paper deals with the modeling of sensitivity of epitaxial graphene Hall bars, from submicrometer to micrometer size, to the stray field generated by a magnetic microbead. To demonstrate experiment feasibility, the model is first validated by comparison to measurement results, considering an ac-dc detection scheme. Then, a comprehensive numerical analysis is performed to investigate signal detriment caused by sensor material heterogeneities, saturation of bead magnetization at high fields, increment of bead distance from sensor surface, and device width increase.

Modeling of graphene Hall effect sensors for microbead detection / Manzin, Alessandra; Simonetto, E.; Amato, Giampiero; Panchal, V.; Kazakova, O.. - In: JOURNAL OF APPLIED PHYSICS. - ISSN 0021-8979. - 117:17(2015), p. 17B732. [10.1063/1.4917323]

Modeling of graphene Hall effect sensors for microbead detection

MANZIN, ALESSANDRA;AMATO, GIAMPIERO;
2015

Abstract

This paper deals with the modeling of sensitivity of epitaxial graphene Hall bars, from submicrometer to micrometer size, to the stray field generated by a magnetic microbead. To demonstrate experiment feasibility, the model is first validated by comparison to measurement results, considering an ac-dc detection scheme. Then, a comprehensive numerical analysis is performed to investigate signal detriment caused by sensor material heterogeneities, saturation of bead magnetization at high fields, increment of bead distance from sensor surface, and device width increase.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/33360
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