Investigation of the complex magnetic behavior of Ni46.86Co2.91Mn38.17Sn12.06 (at%) magnetic shape memory alloy at low temperatures


Yildirim O., YÜCE EMRE S., Bruno N. M. , Doğan E., YURTSEVEN H. H. , DUMAN E., ...More

PHYSICA SCRIPTA, vol.97, no.8, 2022 (SCI-Expanded) identifier identifier

  • 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
  • Van Yüzüncü Yıl University Affiliated: Yes

Abstract

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, beta 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.