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The first order martensitic transition in the ferromagnetic shape memoryalloy Ni45Co5Mn38Sn12 is also a magnetic transition and has a large fieldinduced effect. While cooling in the presence of field this first ordermagnetic martensite transition is kinetically arrested. Depending on thecooling field, a fraction of the arrested ferromagnetic austenite phasepersists down to the lowest temperature as a magnetic glassy state, similar tothe one observed in various intermetallic alloys and in half doped manganites.A detailed investigation of this first order ferromagnetic austenite (FM-A) tolow magnetization martensite (LM-M) state transition as a function oftemperature and field has been carried out by magnetization measurements.Extensive cooling and heating in unequal field (CHUF) measurements and a novelfield cooled protocol for isothermal MH measurements (FC-MH) are utilized toinvestigate the glass like arrested states and show a reverse martensitetransition. Finally, we determine a field -temperature (HT) phase diagram ofNi45Co5Mn38Sn12 from various magnetization measurements which brings out theregions where thermodynamic and metastable states co-exist in the HT spaceclearly depicting this system as a 'Magnetic Glass'.

Magnetic glass in Shape Memory Alloy : Ni45Co5Mn38Sn12