Enhanced and Tuneable Ferromagnetism in CVD-Synthesized Metasurface Carbon Films

Abstract

Abstract Here, metasurface magnetic carbon films synthesized via chemical vapour deposition (CVD) by using adamantane as a precursor and electron beam lithography (EBL) exhibited tuneable magnetic properties. The magnetic properties of carbon films were previously reported to occur from dangling bonds[1]. In this study, we observed a significant increase in saturation magnetization compared to the baseline film by controlling the array size of the metasurface film. Magnetic force microscopy (MFM) measurements confirmed the increasing saturation magnetization of the metasurface film. Magnetization originated from surface dangling bonds; smaller film sizes resulted in higher magnetization due to increased surface area. Furthermore, the saturation magnetization of the CVD carbon film could be tuned by controlling the humidity, and its prediction could be achieved through the utilization of the Raman technique. These findings highlight the potential of metasurface magnetic carbon films for developing tuneable magnetic microscale devices in areas, such as data storage, spintronics, and sensing.