Effect of Annealing on the Structure and Magnetic Properties of CoMnSi

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Ronghui Kou
  • Jianrong Gao
  • Steve M. Heald
  • Brandon L. Fisher
  • Cheng-Jun Sun

Detail(s)

Original languageEnglish
Article number8418727
Journal / PublicationIEEE Transactions on Magnetics
Volume54
Issue number11
Publication statusPublished - 1 Nov 2018
Externally publishedYes

Abstract

This paper reports a comparative study of the magnetization, magnetocaloric effects, and crystal lattices of an as-cast sample and an annealed sample of the CoMnSi compound. Magnetic measurements showed that the annealed sample has high magnetization and a doubled maximum magnetic entropy change with respect to the as-cast sample. X-ray diffraction studies determined that both samples crystallize into an orthorhombic lattice. However, there are remarkable differences in the lattice parameters and one of the nearest Mn-Mn distances between the samples. Spectroscopic measurements of the X-ray absorption near-edge structure revealed that Co-Si bonds of the annealed sample are shorter than those of the as-cast sample due to stronger p - d hybridization of Co and Si atoms, while other chemical bonds do not show any difference. It is concluded that high-temperature annealing enhances ferromagnetic interactions in the lattice of CoMnSi by chemical ordering of Co atoms.

Research Area(s)

  • CoMnSi, extended X-ray absorption fine structure (EXAFS), magnetic materials, magnetocaloric effect

Bibliographic Note

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Citation Format(s)

Effect of Annealing on the Structure and Magnetic Properties of CoMnSi. / Kou, Ronghui; Gao, Jianrong; Ren, Yang et al.
In: IEEE Transactions on Magnetics, Vol. 54, No. 11, 8418727, 01.11.2018.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review