Kinetic arrest and de-arrest in Mn50Ni36Sn9Co5 ferromagnetic shape memory alloy

Kinetic arrest (KA) has been observed in the Mn50Ni36Sn9Co5 ferromagnetic shape memory alloy. Magnetic measurements show that the magnetostructural transformation in Mn50Ni36Sn9Co5 is kinetically arrested below 35 K when the cooling field exceeds 10 kOe. Calculation of the fraction of frozen austenite at 10 K indicates that the fraction of arrested austenite can be tuned from 0 to 45% by adjusting the value of the cooling field. In addition, de-arrest occurs in partially arrested austenite as the magnetic field is reduced at low temperature or as the temperature increases at a constant magnetic field.