Details

Autor(en) / Beteiligte

• Zarkevich, N. A.
• Wang, L.-L.
• Johnson, D. D.
• Materials Science and Engineering, Iowa State University, Ames, Iowa 50011

Titel

Anomalous magneto-structural behavior of MnBi explained: A path towards an improved permanent magnet

Ist Teil von

• APL materials, 2014-03, Vol.2 (3)

Ort / Verlag

United States

Erscheinungsjahr

2014

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Low-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 susceptibility maximum near 90 K, and, importantly for high-temperature magnetic applications, an increasing coercivity (unique to MnBi) above 180  K. We calculate the total energy and magneto-anisotropy energy (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.