|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||2D Materials – Preparation, Properties & Applications
||Ferromagnetism in Q-carbon Balls as a Function of Their Size
||Nayna Khosla, Jagdish Narayan, Kaushik Sarkar, Dhananjay Kumar
|On-Site Speaker (Planned)
The Q- carbon is reportedly the densely packed metastable state phase of carbon with about 80% sp3 content. The pure Q- carbon exhibits extraordinary Hall Effect and room temperature ferromagnetism whereas the Boron doped Q- carbon shows superconductivity. We have created Q-carbon balls (30-50nm) which exhibit ferromagnetism at room temperature for the host of applications ranging from nanosensors to targeted drug delivery. The isothermal field dependent magnetization plots confirm room-temperature ferromagnetism in Q-carbon with a finite coercivity (70Oe) at 300 K and a Curie temperature of 550 K, obtained by the extrapolation of the fits to experimental data using modified Bloch’s law. In Q-carbon balls grown on sapphire, we observed that these magnetic and electrical properties can be attributed to the abundant unpaired electrons near the fermi energy level. This talk will focus on the ferromagnetic properties as a function of size to optimize the magnetic properties.