Enhanced magnetic behavior in carbon encapsulated nickel nanotubules through a linear polymer template

Abstract

Carbon encapsulated Ni nanotubules, synthesized by a simple chemical method with linear polymer templates, reveal a high saturation magnetization (Ms) close to bulk fcc-Ni value, with larger coercivity 140Oe at 300K. An improvement in basic ferromagnetic character is reflected in the remanent magnetization (Mr), which is enhanced to be Mr∕Ms∼0.3, intrinsic of strongly ferromagnetic pseudosingle domains. The TEM images consist of fcc-Ni of ∼350nm long cylindrical tubules with an average 20nm diameter. The sample has two Raman bands of 1350cm−1 (D-band) and 1590cm−1 (G-band) characterizing the presence of a graphitic carbon (disordered).