Effect of magnetic field on the isothermal transformation of a Ni-Mn-In-Co magnetic shape memory alloy

► The isothermal martensitic transformation in a Ni45.0Mn36.7In13.3Co5.0 metamagnetic shape memory alloy has been analyzed. ► A remarkable coincidence of the isothermal transformation rates as a function of the martensite fraction for different applied fields and temperatures has been observed. ► The number of austenite-martensite interfaces plays a relevant role controlling the isothermal kinetics.