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|Title:||Magnetic glass in shape memory alloy : Ni 45 Co 5 Mn 38 Sn 12||Authors:||Lakhani, Archana
Ramanujan, Raju V.
|Keywords:||DRNTU::Engineering::Materials||Issue Date:||2012||Source:||Lakhani, A., Banerjee, A., Chaddah, P., Chen, X., & Ramanujan, R. V. (2012). Magnetic glass in shape memory alloy : Ni 45 Co 5 Mn 38 Sn 12. Journal of physics : condensed matter, 24(38), 386004-.||Series/Report no.:||Journal of physics : condensed matter||Abstract:||The first order martensitic transition in the ferromagnetic shape memory alloy Ni45Co5Mn38Sn12 is also a magnetic transition and has a large field induced effect. While cooling in the presence of a field this first order magnetic martensite transition is kinetically arrested. Depending on the cooling field, a fraction of the arrested ferromagnetic austenite phase persists down to the lowest temperature as a magnetic glassy state, similar to the one observed in various intermetallic alloys and in half doped manganites. A detailed investigation of this first order ferromagnetic austenite (FM-A) to low magnetization martensite (LM-M) state transition as a function of temperature and field has been carried out by magnetization measurements. Extensive cooling and heating in unequal field (CHUF) measurements and a novel field cooled protocol for isothermal MH measurements (FC–MH) are utilized to investigate the glass like arrested states and show a reverse martensite transition. Finally, we determine a field–temperature (HT) phase diagram of Ni45Co5Mn38Sn12 from various magnetization measurements which brings out the regions where thermodynamic and metastable states coexist in the HT space, clearly depicting this system as a 'magnetic glass'.||URI:||https://hdl.handle.net/10356/98062
|Appears in Collections:||MSE Journal Articles|
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