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Large linear non-saturating magnetoresistance and high mobility in ferromagnetic MnBi

Author

Listed:
  • Yangkun He

    (Max-Planck-Institute for Chemical Physics of Solids)

  • Jacob Gayles

    (Max-Planck-Institute for Chemical Physics of Solids
    University of South Florida)

  • Mengyu Yao

    (Max-Planck-Institute for Chemical Physics of Solids)

  • Toni Helm

    (Max-Planck-Institute for Chemical Physics of Solids
    Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden–Rossendorf)

  • Tommy Reimann

    (Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden–Rossendorf)

  • Vladimir N. Strocov

    (Swiss Light Source, Paul Scherrer Institut)

  • Walter Schnelle

    (Max-Planck-Institute for Chemical Physics of Solids)

  • Michael Nicklas

    (Max-Planck-Institute for Chemical Physics of Solids)

  • Yan Sun

    (Max-Planck-Institute for Chemical Physics of Solids)

  • Gerhard H. Fecher

    (Max-Planck-Institute for Chemical Physics of Solids)

  • Claudia Felser

    (Max-Planck-Institute for Chemical Physics of Solids)

Abstract

A large non-saturating magnetoresistance has been observed in several nonmagnetic topological Weyl semi-metals with high mobility of charge carriers at the Fermi energy. However, ferromagnetic systems rarely display a large magnetoresistance because of localized electrons in heavy d bands with a low Fermi velocity. Here, we report a large linear non-saturating magnetoresistance and high mobility in ferromagnetic MnBi. MnBi, unlike conventional ferromagnets, exhibits a large linear non-saturating magnetoresistance of 5000% under a pulsed field of 70 T. The electrons and holes’ mobilities are both 5000 cm2V−1s−1 at 2 K, which are one of the highest for ferromagnetic materials. These phenomena are due to the spin-polarised Bi 6p band’s sharp dispersion with a small effective mass. Our study provides an approach to achieve high mobility in ferromagnetic systems with a high Curie temperature, which is advantageous for topological spintronics.

Suggested Citation

  • Yangkun He & Jacob Gayles & Mengyu Yao & Toni Helm & Tommy Reimann & Vladimir N. Strocov & Walter Schnelle & Michael Nicklas & Yan Sun & Gerhard H. Fecher & Claudia Felser, 2021. "Large linear non-saturating magnetoresistance and high mobility in ferromagnetic MnBi," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-24692-7
    DOI: 10.1038/s41467-021-24692-7
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