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Title: Magnetic glass in shape memory alloy : Ni 45 Co 5 Mn 38 Sn 12
Authors: Lakhani, Archana
Chaddah, P.
Chen, X.
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'.
DOI: 10.1088/0953-8984/24/38/386004
Schools: School of Materials Science & Engineering 
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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