Abstract
The control of the morphologies and thus the optical, electrical, and magnetic effect of 2D thin films is a challenging task for the development of cost-efficient devices. In particular, the angular dependent magnetoresistance (MR) of surface thin films up to room temperature is an interesting phenomenon in materials science. Here, we report amorphous carbon thin films fabricated through chemical vapor deposition at a SiO2 substrate. Their structural and angular magnetoresistance properties were investigated by several analytical tools. Specifically, we used a physical property measurement system to estimate the magnitude of the angular MR of these as-prepared sample thin films from 2 K to 300 K. An angular MR magnitude of 1.6% for the undoped a-carbon thin films was found up to 300 K. Under the magnetic field of 7 T, these films possessed an angular MR of 15% at a low temperature of 2 K. A high disorder degree leads to a large magnitude of MR. The grain boundary scattering model was used to interpret the mechanism of this angular MR.
Highlights
In recent years, 2D materials including inorganic layered crystals and organic thin films have gained considerable interest owing to their wide applications
A similar phenomenon is happening for our a-carbon thin films, where 3–5 nm sized graphitic nanocrystallites are embedded in the amorphous carbon matrix
A similar phenomenon is happening for our a-carbon thin films, lower temperatures such as 20~70 K, and a similar effect can be observed for higher temperatures where 3–5 nm sized graphitic nanocrystallites are embedded in the amorphous carbon matrix
Summary
2D materials including inorganic layered crystals and organic thin films have gained considerable interest owing to their wide applications. Besides crystal materials existing in nature, we have witnessed how scientists create 2D materials via materials synthesis and fabrication strategies. Among these materials, the preparation and characterization of amorphous carbon (a-carbon)-based films have drawn a special consideration due to their possible applications in magnetic sensing, gas sensing, solar cells, and optoelectronics, to name just a few [1,2,3,4,5]. The a-carbon is one of the allotropes of carbon for which the magnetotransport properties significantly depend on the structural disorder in thin films. Owing to magnetic field applications, Crystals 2019, 9, 124; doi:10.3390/cryst9030124 www.mdpi.com/journal/crystals
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
