  Molybdenum disulphide, a diamagnetic layered dichalcogenide solid, is found
to show magnetic ordering at room temperature when exposed to a 2 MeV proton
beam. The temperature dependence of magnetization displays ferrimagnetic
behavior with a Curie temperature of 895 K. A disorder mode corresponding to a
zone-edge phonon and a Mo valence higher than +4, have been detected in the
irradiated samples using Raman and X-ray photoelectron spectroscopy,
respectively. The possible origins of long-range magnetic ordering in
irradiated MoS2 samples are discussed.
