Anomalous magneto-structural behavior of MnBi explained: A path towards an improved permanent magnetAPL Materials
AbstractLow-temperature MnBi (hexagonal NiAs phase) exhibits anomalies in the lattice constants (a, c) and bulk elastic modulus (B) below 100 K, spin reorientation and magnetic susceptibilitymaximum near 90 K, and, importantly for high-temperature magnetic applications, an increasingcoercivity (unique to MnBi) above 180 K. We calculate the total energy and magneto-anisotropyenergy (MAE) versus (a, c) using DFT+U methods. We reproduce and explain all the above anomalies. We predict that coercivity and MAE increase due to increasing a, suggesting means to improve MnBi permanent magnets.
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Citation InformationNikolai A. Zarkevich, Linlin Wang and Duane D. Johnson. "Anomalous magneto-structural behavior of MnBi explained: A path towards an improved permanent magnet" APL Materials Vol. 2 Iss. 3 (2014) p. 032103
Available at: http://works.bepress.com/nikolai_zarkevich/1/