Investigation of the complex magnetic behavior of Ni46.86Co2.91Mn38.17Sn12.06(at%) magnetic shape memory alloy at low temperatures
Physica Scripta, vol.97, no.8, 2022 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 97 Issue: 8
- Publication Date: 2022
- Doi Number: 10.1088/1402-4896/ac7bb4
- Journal Name: Physica Scripta
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Chemical Abstracts Core, Compendex, INSPEC, zbMATH
- Keywords: magnetic shape-memory alloys, martensitic transformation, magnetic field induced transition, molecular field theory, power-law analysis, superspin glass, MARTENSITIC-TRANSFORMATION, MAGNETOCALORIC PROPERTIES
- Middle East Technical University Affiliated: Yes
Abstract
© 2022 IOP Publishing Ltd.The magnetic properties, martensitic transformation characteristics, the magnetic field-induced transformation characteristics, and super spin-glass behaviour at low temperature of Ni46.86Co2.91Mn38.17Sn12.06 (at%) magnetic shape memory alloys (MSMAs) were investigated under various magnetic field levels over temperature intervals from 400 K to 10 K. We observe a small magnetization difference during the martensitic transition evidenced with a visible thermal hysteresis. To investigate the magnetic field induced phase fraction, the minimum magnetic field required to start and complete the magnetostructural phase transition is computed. Super-spin glass features in magnetic data are observed that interacting magnetic clusters are frozen below a critical temperature. Magnetization is computed as a function of temperature at various constant fields using molecular field theory. The critical exponent, β is deduced for the temperature-induced magnetization, which indicates that the MSMA exhibited ferromagnetic ordering during field-cooling and on heating an antiferromagnetic ordering at low temperatures and in low applied magnetic fields. These observations are consistent within the framework of an Ising or Heisenberg model.