Graphene Magnetoresistance Control by Photoferroelectric Substrate

Abstract

Ultralow dimensionality of 2D layers magnifies their sensitivity to adjacent charges enabling even postprocessing electric control of multifunctional structures. However, functionalizing 2D layers remains an important challenge for on-demand device–property exploitation. Here we report that an electrical and even fully optical way to control and write modifications to the magnetoresistive response of CVD-deposited graphene is achievable through the electrostatics of the photoferroelectric substrate. For electrical control, the ferroelectric polarization switch modifies graphene magnetoresistance by 67% due to a Fermi level shift with related modification in charge mobility. A similar function is also attained entirely by bandgap light due to the substrate photovoltaic effect. Moreover, an all-optical way to imprint and recover graphene magnetoresistance by light is reported as well as magnetic control of graphene transconductance. These findings extend photoferroelectric control in 2D structures to magnetic dimensions and advance wireless operation for sensors and field-effect transistors.

A label-free H1N1 influenza virus immunosensor based on an N-LIG/Au laser induced graphene microelectrode

“…These modifications are effective in obtaining graphene electrode materials with excellent electrochemical properties. 6,7 Some of the strategies include plasma modification, 8,9 loading with transition metal oxides, 10 coating with conductive polymers, 11,12 and doping with heteroatoms. 13 It should be noted that heteroatom doping can modify the local elemental composition of host materials, which in turn can alter the characteristics of charge transport and the chemical properties of the materials.…”