Magnetic Properties of Intermediate Ni2-xMn1+xSb Full-Heusler Compounds. (October 2021)

• Record Type: Journal Article
• Authors: Govind, Bal; Bharti, Purnima; Srivastava, Manisha; Kumar, Ashish; Bano, Sahiba; Bhatt, Komal; Tawale, J.S.; Pulikkotil, J.J.; Misra, D.K.
• Is Part Of: Materials research bulletin. Volume 142(2021)
• Publication Date: 2021-10
• Subjects: Intermediate compounds of Full Heusler -- Hysteresis Curve -- Stoner criterion of ferromagnetism -- Slater Pauling Rule -- Density Functional Theory Calculation; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2021.111427
• Languages: English
• ISSNs: 0025-5408

Abstract

Highlights: Full-Heuslers Ni2-X Mn1+X Sb (0.25 ≤ x ≤ 0.75 ) exhibited highest magnetic moment. Ferromagnetic behavior is observed for all the compositions. Theoretically calculated results are also consistent with the experimental results. Abstract: Investigation of intermediate compounds of Heusler alloys has been the prime focus to study the various magnetic properties. We have successfully synthesized non-stoichiometric full- Heusler intermediate compounds of Ni2-x Mn1+x Sb (0.25≤x≤0.75) to investigate their magnetic properties. XRD analysis using Rietveld refinement reveals the presence of a single-phase of Cu2 MnAl prototype full-Heusler phase. Transmission electron microscopy analysis also confirms the presence of a single phase of best optimized composition (Ni1.5 Mn1.5 Sb) of full-Heusler alloy. Interestingly, the saturated magnetic moments obtained from the M-H curves were found to be 4.45 μ B /f.u., 3.16 μ B /f.u. and 4.65 μ B /f.u. for Ni2-x Mn1+x Sb (x= 0.25, 0.5, 0.75) respectively which is the highest reported value (~4.65 μ B /f.u. for Ni1.25 Mn1.75 Sb) so far in this family of the compounds. Further, the reversibility of zero-field cooled (ZFC) and field cooled (FC) curves indicate that samples are stabilized in a magnetically homogeneous state. The first principle calculation performed on these materials is well corroborated with the experimental results. Graphical Abstract: Schematic diagram showing Mn on Ni and Ni on Mn site with compositionally varying full Heusler structure. Highest magnetic moment (4.45 μ B /f.u and 4.65 μ B /f.u) optimized for Ni1.75 Mn1.25 Sb and Ni1.25 Mn1.75 Sb full Heusler Image, graphical abstract