Mn-based Heusler Compounds with Low Magnetization

ORAL

Abstract

Heusler compounds with small or zero magnetization are of interest for spintronics applications, because they cause little or no fringing fields and may exhibit ultrafast dynamics and high spin polarization [1-3]. We find virtually zero room-temperature magnetizations in stoichiometric Ru2MnSn and Pt2MnGa Heusler alloys fabricated by rapid quenching from the melt. X-ray diffraction patterns show the formation of a L21 structures with a = 6.22 Å and a tetragonal structure with a = 4.02 Å and c = 7.24 Å in Ru2MnSn and Pt2MnGa, respectively. Both systems show nearly linear M(H) curves for intermediate field strengths of several T, and the slopes dM/dH are used to characterize the spin structure. In Pt2MnGa, which shows a helical spins structure with an ordering temperature of about 350 K [4], dM/dH increases with decreasing spiral wave vector q. The complex spin structures of Ru2MnSn and Pt2MnGa are used to explain the electron-transport properties of the alloys.

References
[1] W. Zhang et al., J. Phys. D 51, 255001 (2018).
[2] M.E. Jamer et al., Phys. Rev. Appl. 7, 064036 (2017).
[3] A. Hirohata et al., J. Phys. D 50, 443001 (2017).
[4] S. Singh et al., Nat. Comm. 7, 12671 (2016).

*This research is supported by the NSF-DMREF: SusChEM (1729288) and NSF-NNCI (1542182) and NCMN-NRI.

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Presenters

  • David Sellmyer

    • Physics & Astronomy, University of Nebraska, Lincoln
    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy,, University of Nebraska, Lincoln, Nebraska 68588-0299, USA
    • University of Nebraska - Lincoln
    • Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE, United States

Authors

  • Wenyong Zhnag

    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy,, University of Nebraska, Lincoln, Nebraska 68588-0299, USA
    • Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE, United States

  • Balamurugan Balasubramanian

    • Physics & Astronomy, University of Nebraska, Lincoln
    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy,, University of Nebraska, Lincoln, Nebraska 68588-0299, USA
    • University of Nebraska - Lincoln

  • Rabindra Pahari

    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy,, University of Nebraska, Lincoln, Nebraska 68588-0299, USA
    • University of Nebraska - Lincoln

  • Ahsan Ullah

    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy,, University of Nebraska, Lincoln, Nebraska 68588-0299, USA
    • University of Nebraska - Lincoln

  • Shah Valloppilly

    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy,, University of Nebraska, Lincoln, Nebraska 68588-0299, USA
    • Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE, United States

  • Ralph Skomski

    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy,, University of Nebraska, Lincoln, Nebraska 68588-0299, USA
    • University of Nebraska - Lincoln

  • David Sellmyer

    • Physics & Astronomy, University of Nebraska, Lincoln
    • Nebraska Center for Materials and Nanoscience and Department of Physics and Astronomy,, University of Nebraska, Lincoln, Nebraska 68588-0299, USA
    • University of Nebraska - Lincoln
    • Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE, United States