Singh, Nidhi and Borgohain, Barsha and Srivastava, A. K. and Dhar, Ajay and Singh, H. K. (2016) Magnetic nature of the austenite-martensite phase transition and spin glass behaviour in nanostructured Mn2Ni1.6Sn0.4 melt-spun ribbons. Applied Physics A: Materials Science and Processing, 122 (3). pp. 1-8. ISSN 0947-8396

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Nanocrystalline ribbons of inverse Heusler alloy Mn2Ni1.6Sn0.4 have been synthesised by melt spinning of the arc-melted bulk precursor. The single-phase ribbons crystallize into a cubic structure and exhibit very fine crystallite size of <2 nm. Temperature-dependent magnetization (M-T) measurements reveal ferromagnetic-austenite (FM-A)-antiferromagnetic-martensite (AFM-M) phase transition that begins at M-S approximate to 249 K and finishes at M-f approximate to 224 K. During warming, the reverse AFM-M to FM-A transitions begins at A(s) approximate to 240 K and finishes at A(f) approximate to 261 K. A re-entrant FM transition is observed in the M-phase at T-CM approximate to 145 K. These transitions are also confirmed by temperature-dependent resistivity (rho-T) measurements. The hysteretic behaviour of M-T and rho-T in the temperature regime spanned by the A-M transition is a manifestation of the first-order phase transition. M-T and rho-T data also provide unambiguous evidence in favour of spin glass at T < T-CM. The scaling of the glass freezing temperature (T-f) with frequency, extracted from the frequency-dependent AC susceptibility measurements, confirms the existence of canonical spin glass at T < T-CM approximate to 145 K. The occurrence of canonical spin glass has been explained in terms of the nanostructuring modified interactions between the coexisting FM and AFM correlations in the martensitic phase.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Springer Verlag.
Subjects: Materials Science
Applied Physics/Condensed Matter
Depositing User: Dr. Rajpal Walke
Date Deposited: 30 Jan 2018 11:23
Last Modified: 30 Jan 2018 11:23

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