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Nanocrystalline ribbons of inverse Heusler alloy Mn2Ni1.6Sn0.4 have beensynthesised by melt spinning of the arc melted bulk precursor. The single phaseribbons crystallize into a cubic structure and exhibit very fine crystallitesize of < 2 nm. Temperature dependent magnetization (M-T) measurements revealthat austenite (A)-martensite (M) phase transition begins at T~248 K andfinishes at T~238 K during cooling cycle and these values increase to T~267 Kand T~259 K while warming. In cooling cycle, the A-phase shows ferromagnetic(FM) ordering with a Curie temperature T~267 K, while both theFM-antiferromagnetic (AFM) and M-transitions occur at T~242 K. The M-phaseundergoes FM transition at T~145 K. These transitions are also confirmed bytemperature dependent resistivity measurements. The observed hystereticbehaviour of magnetization and resistivity in the temperature regime spanned bythe A-M transition is a manifestation of the first order phase transition.Magnetization and susceptibility data also provide unambiguous evidence infavour of spin glass . The scaling of the glass freezing temperature (Tf) withfrequency, extracted from the frequency dependent AC susceptibilitymeasurements, confirms the existence of canonical spin glass at T<145 K. Theoccurrence of canonical spin glass has been explained in terms of thenanostructuring modified interactions between the FM correlations in themartensitic phase and the coexisting AFM.

Structural, electrical and magnetic properties of nanostructured Mn2Ni1.6Sn0.4 melt spun ribbons