Novel magnetic properties of CoTe nanorods and diversified CoTe nanostructures obtained at different NaOH concentrations.

CoTe and CoTe nanorods with average diameter of 100 nm were synthesized by a simple hydrothermal process, and different CoTe nanostructures were obtained by changing the NaOH concentration. CoTe nanorods exhibit weak ferromagnetism while CoTe nanorods present paramagnetic behavior. Different magnetic behaviors occur in the other CoTe nanostructures due to Na entrance into CoTe crystals. A first-principles study on Na-doped CoTe confirms the magnetic characteristics.