A MnBi alloy containing over 90 wt% low-temperature phase (LTP) has been obtained by high-temperature sintering and magnetic purification. The coercivity of the bonded MnBi magnet increases with increasing temperatures. A coercivity of 2.0 T has been achieved at 400 K. The maximum energy product (BH)max; of the magnet is 7.7 MGOe (61 kJ/m3) and 4.6 MGOe (37 kJ/m3) at room temperature and 400 K, respectively. Neutron diffraction and magnetic data reveal a spin reorientation, which gives rise to low anisotropy fields and coercivity at lower temperatures for the LTP MnBi alloy.
J. Yang et al., "Magnetic Properties of the MnBi Intermetallic Compound," Applied Physics Letters, vol. 79, no. 12, pp. 1846 - 1848, American Institute of Physics (AIP), Sep 2001.
The definitive version is available at https://doi.org/10.1063/1.1405434
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© 2001 American Institute of Physics (AIP), All rights reserved.
17 Sep 2001