1. Large linear non-saturating magnetoresistance and high mobility in ferromagnetic MnBi.
- Author
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He, Yangkun, Gayles, Jacob, Yao, Mengyu, Helm, Toni, Reimann, Tommy, Strocov, Vladimir N., Schnelle, Walter, Nicklas, Michael, Sun, Yan, Fecher, Gerhard H., and Felser, Claudia
- Subjects
MAGNETORESISTANCE ,MESONS ,FERMI energy ,FERROMAGNETIC materials ,CHARGE carriers ,CHARGE carrier mobility - 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 cm
2 V−1 s−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. Ferromagnetic systems rarely display a large or non-saturating magnetoresistance, due to the low Fermi velocity of the predominant charge carrier. Here, the authors show that MnBi, a ferromagnet, bucks this trend, showing both large and non-saturating magnetoresistance, and high charge carrier motilities. [ABSTRACT FROM AUTHOR]- Published
- 2021
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