Abstract
Room-temperature ferromagnetism has been observed in high density free-standing CrSi 2 (core) / SiO 2 (shell) semiconducting nanocables, which is contrast to diamagnetic properties of both CrSi 2 and SiO 2 in bulk. The hexagonal CrSi 2 C40-type nanowires, sheathed with a thin amorphous SiO 2 layer, grow along [0001] direction. The results of first-principles simulations indicate that Cr atoms around the interface are with anomalously high magnetization (about 2 μ B /atom), due to distorted/dangling bonds and surrounded oxygen atoms. Evaluations can be very consistent with measurements by further considering the effects of interfacial roughness and more distribution of oxygen around the interface. These results point toward a different way to tune nanomagnetism in core/shell nanowires. © 2011 American Institute of Physics.