Magnetic and magnetocaloric properties of martensitic Ni2Mn1.4Sn0.6 Heusler alloy

• DOI: 10.1016/j.jmmm.2012.02.080
• Publication Date: 2012-02-25T16:00:58Z
• Authors: Volodymyr A. Cher...; Jose M. Barandiarán; Jesus Rodriguez F...; Daniel P. Rojas; Jon Gutiérrez; Patricia Lázpita; Iñaki Orue
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract The evolutions of magnetic properties at low temperatures and the influence of magnetic field on the temperature dependence of specific heat in martensitic Ni 2 Mn 1.4 Sn 0.6 Heusler alloy are studied. The frequency-dependent blocking temperature and considerable exchange bias below it are measured in the martensitic phase. From the analysis of the specific heat curves under magnetic field, a large inverse magnetocaloric effect manifested as the magnetic field induced rise of isothermal magnetic entropy and/or magnetic field induced adiabatic temperature decrease in the vicinity of the reverse magnetostructural transformation and a significant value of the conventional magnetocaloric effect at the Curie temperature are obtained. The Debye temperature and electronic coefficient equal to Θ D =310±2 K and γ = 16.6±0.3 mJ/K 2 mol, respectively, do not depend on the magnetic field.