Magnetic and structural properties of Co$_2$MnSi based Heusler compound

S. J. Ahmed; C. Boyer; M. Niewczas

doi:10.1016/j.jallcom.2018.12.018

Magnetic and structural properties of Co$_2$MnSi based Heusler compound

Materials Science 2019-10-18 v3

Authors: S. J. Ahmed , C. Boyer , M. Niewczas

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Abstract

The influence of antisite disorder occupancies on the magnetic properties of the half-metallic Co $_2$ MnSi compound was studied by experimental techniques and first-principles calculations. The neutron diffraction studies show almost identical amount of Mn and Co disorders of 6.5\% and 7.6\%, which was found to be in good agreement with density functional theory (DFT) calculations of the stable Co $_2$ MnSi system with the corresponding disorders. DFT studies reveal that antiferromagnetic interactions introduced by Mn disorder lead to a reduction of the net magnetic moment. The results are discussed in conjunction with neutron diffraction and magnetization measurements. Transport property measurement under magnetic field up to 9 Tesla revealed a positive magnetoresistance for bulk Co $_2$ MnSi that persists up to room temperature. A Curie temperature of $\sim$ 1014 K was determined for the compound by high temperature electrical resistivity and dilatometry measurements.

Keywords

heusler compound co2mnsi antisite disorder magnetic properties neutron diffraction density functional theory magnetoresistance

Cite

@article{arxiv.1808.05743,
  title  = {Magnetic and structural properties of Co$_2$MnSi based Heusler compound},
  author = {S. J. Ahmed and C. Boyer and M. Niewczas},
  journal= {arXiv preprint arXiv:1808.05743},
  year   = {2019}
}

Magnetic and structural properties of Co$_2$MnSi based Heusler compound

Abstract

Keywords

Cite

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