Room temperature Co-doped manganite/graphene sensor operating at high pulsed magnetic fields

Rasuole Lukose; Nerija Zurauskiene; Voitech Stankevic; Milita Vagner; Valentina Plausinaitiene; Gediminas Niaura; Skirmantas Kersulis; Saulius Balevicius; Eleonora Bolli; Alessio Mezzi; Saulius Kaciulis

doi:10.1038/s41598-019-46012-2

Room temperature Co-doped manganite/graphene sensor operating at high pulsed magnetic fields

Sci Rep. 2019 Jul 1;9(1):9497. doi: 10.1038/s41598-019-46012-2.

Authors

Rasuole Lukose¹, Nerija Zurauskiene^{2

3}, Voitech Stankevic^{2

3}, Milita Vagner^{2

4}, Valentina Plausinaitiene^{2

4}, Gediminas Niaura⁵, Skirmantas Kersulis², Saulius Balevicius², Eleonora Bolli⁶, Alessio Mezzi⁶, Saulius Kaciulis⁶

Affiliations

¹ Department of Functional Materials and Electronics, Center for Physical Sciences and Technology, LT-10257, Vilnius, Lithuania. rasuole.lukose@ftmc.lt.
² Department of Functional Materials and Electronics, Center for Physical Sciences and Technology, LT-10257, Vilnius, Lithuania.
³ Department of Electrical Engineering, Faculty of Electronics, Vilnius Gediminas Technical University, LT- 10223, Vilnius, Lithuania.
⁴ Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, LT- 03225, Vilnius, Lithuania.
⁵ Department of Organic Chemistry, Center for Physical Sciences and Technology, LT-10257, Vilnius, Lithuania.
⁶ Institute for the Study of Nanostructured Materials, ISMN - CNR, P.O. Box 10, Monterotondo, Rome, Italy.

Abstract

The demand to increase the sensitivity to magnetic field in a broad magnetic field ranges has led to the research of novel materials for sensor applications. Therefore, the hybrid system consisting of two different magnetoresistive materials - nanostructured Co-doped manganite La_1-xSr_x(Mn_1-yCo_y)_zO₃ and single- and few-layer graphene - were combined and investigated as potential system for magnetic field sensing. The negative colossal magnetoresistance (CMR) of manganite-cobaltite and positive one of graphene gives the possibility to increase the sensitivity to magnetic field of the hybrid sensor. The performed magnetoresistance (MR) measurements of individual few layer (n = 1-5) graphene structures revealed the highest MR values for three-layer graphene (3LG), whereas additional Co-doping increased the MR values of nanostructured manganite films. The connection of 3LG graphene and Co-doped magnanite film in a voltage divider configuration significantly increased the sensitivity of the hybrid sensor at low and intermediate magnetic fields (1-2 T): 70 mV/VT of hybrid sensor in comparison with 56 mV/VT for 3LG and 12 mV/VT for Co-doped magnanite film, respectively, and broadened the magnetic field operation range (0.1-20) T of the produced sensor prototype.