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

Yangkun He (), Jacob Gayles, Mengyu Yao, Toni Helm, Tommy Reimann, Vladimir N. Strocov, Walter Schnelle, Michael Nicklas, Yan Sun, Gerhard H. Fecher and Claudia Felser
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Yangkun He: Max-Planck-Institute for Chemical Physics of Solids
Jacob Gayles: Max-Planck-Institute for Chemical Physics of Solids
Mengyu Yao: Max-Planck-Institute for Chemical Physics of Solids
Toni Helm: Max-Planck-Institute for Chemical Physics of Solids
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

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-24692-7

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