Magnetostriction and Magnetic Anisotropy of MnBi

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Abstract
The magnetostriction of oriented polycrystalline MnBi was found to be higher than any published value for a metal. A value of −250×10−6 was measured parallel to a field of 22 000 oersteds oriented perpendicular to the c axis of the aligned hexagonal crystallites. This field magnetized the specimen to only slightly more than half of saturation. A tentative value of −800×10−6 for the magnetostriction at saturation was obtained by plotting the magnetostriction as a function of (B‐H)2 and extrapolating to saturation. Magnetic anisotropy constants of K1=9.1×106 ergs per cm3 and K2=2.6×106 ergs per cm3 were obtained by fitting a calculated curve to the experimental magnetization curve.