Magnetic properties of the MnBi intermetallic compound

Yang, J. B.; Kamaraju, K.; Yelon, W. B.; James, W. J.; Cai, Q.; Bollero, A.
September 2001
Applied Physics Letters;9/17/2001, Vol. 79 Issue 12, p1846
Academic Journal
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)[sub max] of the magnet is 7.7 MGOe (61 kJ/m[sup 3]) and 4.6 MGOe (37 kJ/m[sup 3]) 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. © 2001 American Institute of Physics.


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