Magnetic ordering in Ni-Co-Mn-Sn-based ferromagnetic shape memory alloy (FSMA)
Co-doped Ni-Mn-Sn-based Heusler alloys manifest many interesting magnetic and magneto-structural effects like IMCE (inverse magnetocaloric effect), MFIRT (magnetic field induced reverse transformation) and KA (kinetic arrest), as a result of a combination of first order structural (martensitic) transformation and multiple second order magnetic transitions. However, its low-temperature magnetic transitions in martensitic state are particularly complex with the possible presence of a paramagnetic to anti-ferromagnetic and / or ferromagnetic ordering. Small-angle neutron scattering (SANS) is especially suited to decipher these complex transitions since the mesoscopic density fluctuations due to formation of spin clusters can be probed by this technique. The current study will explore the magnetic transitions in Ni45Co5Mn38Sn12 using in-situ SANS at several key temperatures, in combination with detailed temperature-dependent magnetometry and thermal analyses. Combination of these complementary techniques would provide valuable insight into multiple magnetic transitions and resolve the underlying mechanism with the help of direct observation of spin clusters.
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BISWAS Aniruddha; AHLAWAT Sarita; HONECKER Dirk; KRISHNAN Madangopal; SARKAR Sudip Kumar and SEN DEBASIS. (2014). Magnetic ordering in Ni-Co-Mn-Sn-based ferromagnetic shape memory alloy (FSMA). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-01-139
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