Abstract
Recent advances in the fabrication and classification of amorphous carbon (a-Carbon) thin films play an active part in the field of surface materials science. In this paper, a pulsed laser deposition (PLD) technique through controlling experimental parameters, including deposition time/temperature and laser energy/frequency, has been employed to examine the substrate effect of amorphous carbon thin film fabrication over SiO2 and glass substrates. In this paper, we have examined the structural and magnetoresistance (MR) properties of these thin films. The intensity ratio of the G-band and D-band (ID/IG) were 1.1 and 2.4, where the C(sp2) atomic ratio for the thin films samples that were prepared on glass and SiO2 substrates, were observed as 65% and 85%, respectively. The MR properties were examined under a magnetic field ranging from −9 T to 9 T within a 2-K to 40-K temperature range. A positive MR value of 15% was examined at a low temperature of 2 K for the thin films grown on SiO2 substrate at a growth temperature of 400 °C using a 300 mJ/pulse laser frequency. The structural changes may tune the magnetoresistance properties of these a-Carbon materials. These results were demonstrated to be highly promising for carbon-based spintronics and magnetic sensors.
Highlights
In the past two and half decades, since graphene was determined to be a “wonder material”, conjugated carbon-based materials, especially carbon nanomaterials and fullerenes, have been considered as important research due to their exclusive properties
The magnetotransport characteristics of a-Carbon thin films largely depend on the size of C(sp2 ) clusters, structural disorder, and C(sp2 ) fractions
Most scientists have seriously investigated the relationship between magnetotransport properties at structural disorders, and they have examined the underpinning mechanisms of the transport properties of pure a-Carbon materials
Summary
In the past two and half decades, since graphene was determined to be a “wonder material”, conjugated carbon-based materials, especially carbon nanomaterials and fullerenes, have been considered as important research due to their exclusive properties. The magnetotransport characteristics of a-Carbon thin films largely depend on the size of C(sp2 ) clusters, structural disorder, and C(sp2 ) fractions. Disorder is an important factor that influences the conductivity of materials. Most scientists have seriously investigated the relationship between magnetotransport properties at structural disorders, and they have examined the underpinning mechanisms of the transport properties of pure a-Carbon materials. An enormous amount of work has been performed, numerous hidden transport properties of these films remain essential to uncover [6,7,8,9,10]
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