title: Magnetic properties of epsilon-Fe(3)N-GaN core-shell nanowires.
abstract: epsilon-Fe(3)N-GaN core-shell nanowires are synthesized by the wet chemical route and by nitridation of the Fe-Ga-oxide nanowires in flowing NH(3) (g). The encapsulation by the GaN shell protects the epsilon-Fe(3)N core and spin-glass-like cooperative ordering is observed at low temperatures. Magnetic disorder occurs at the epsilon-Fe(3)N-GaN interface, giving rise to the spin-glass-like state below 50 K because of the presence of anti-ferromagnetic (AF) mixed oxynitrides and ferromagnetic (FM) epsilon-Fe(3)N nitride and the random distribution of epsilon-Fe(3)N in the interface region. The spin-glass-like ordering is probed by relaxation and ac susceptibility experiments.
authors.affiliation: Department of Chemistry, Indian Institute of Technology, Kanpur-208 016, Uttar Pradesh, India. The Institute of Nanotechnology, Forschungszentrum Karlsruhe, PO Box 3640, 76021 Karlsruhe, Germany.
authors.forename: N S
authors.initials: NS
authors.lastname: Gajbhiye
authors.forename: Sayan
authors.initials: S
authors.lastname: Bhattacharyya