Magnetic and Magnetocaloric Properties of NiFeMnGa<sub>0.5</sub>Sn<sub>0.5</sub> Heusler Alloy

ORAL

Abstract

Heusler alloys have attracted recent attention because of their multiple interesting properties with prospects for spintronics, energy technology and magnetic refrigeration. Additionally, the magnetic properties of these materials can be tuned to fit specific applications by adjusting the elemental composition. Here, we present our investigation on how the structural order and magnetic properties of a Heusler alloy NiFeMnGa can be modified by replacing a fraction of Ga with Sn. We have investigated NiFeMnGa0.5Sn0.5 alloy prepared by arc melting and annealing. The samples show highly ordered cubic LiPdMnSn-type crystal structure. The samples are ferromagnetic at room temperature with the Curie temperature of 336 K. The high-field (3T) magnetization at 100 K is 61 emu/g. We will discuss the effect of nanostructuring and heat treatment on the structural, magnetic, and magnetocaloric properties of this material. We will also present the first-principle results of the band structure and magnetic properties and compare them with the observed experimental data.

*This research is supported by Scholarly Excellence Funds, SDSU. Work at Nebraska is supported by NSF grnats DMREF 1436385, ECCS 1542182 and NCMN. Work at University of Northern Iowa is supported by the Faculty Summer Fellowship.

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Presenters

  • Jace Waybright

    • South Dakota State Univ

Authors

  • Jace Waybright

    • South Dakota State Univ

  • Parashu Kharel

    • South Dakota State Univ
    • Physics, South Dakota State University

  • Lee Halbritter

    • South Dakota State Univ

  • Hanyang Qian

    • South Dakota State Univ

  • Rabindra Pahari

    • University of Nebraska
    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy, Univ of Nebraska - Lincoln

  • Shah Valloppilly

    • University of Nebraska

  • Pavel Lukashev

    • University of Northern Iowa
    • Physics, University of Northern Iowa

  • Yung Huh

    • South Dakota State Univ

  • David Sellmyer

    • University of Nebraska
    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy, Univ of Nebraska - Lincoln
    • Physics and Astronomy, University of Nebraska