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Boron carbonitride (BxCyNz) represents an interesting family of materialscontaining all light elements and two dimensional graphene like hybrid layers.Although rich literature exists on this peculiar material in chemicallyprocessed form, there are relatively fewer reports on device application-worthythin film form. This form also offers a natural platform for basic studies onimportant aspects such as magnetism and transport, which have attractedattention in the context of ferromagnetism in doped and defect carbon systems.Thus, in this work we have grown thin films of this compound using Pulsed LaserDeposition (PLD) method, and investigated their magnetic and transportproperties in their entirety along with the detailed electronic structure usingvarious spectroscopic techniques like X-ray photoelectron spectroscopy (XPS),Valence Band Spectroscopy (VBS) and X-ray absorption near edge spectroscopy(XANES). In depth analysis of the typical role of dopants and defects,especially the prevalent nitrogen defects, is elucidated using DensityFunctional Theory (DFT) calculations to understand the experimentalobservations. A dramatic crossover in the transport mechanism of chargecarriers is observed in this system with the change in doping level of specificnitrogen defects. A robust and high saturation magnetization is achieved in BCNfilms which is higher by almost hundred times as compared to that in similarlygrown undoped carbon film. An anomalous transition and increase in coercivefield is also observed at low temperature. A careful analysis brings out theintriguing role of specific nitrogen defects in defining the peculiar natureand concentration dependence of the physical properties of this system.

Nature of magnetism and transport in BxCyNz thin films: The intriguing role of nitrogen defects in the electronic structure