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Composites made up of MnBi needles embedded in bismuth single crystals are grown from eutectic melts by both Czochralski and zone‐melting techniques. The galvanomagnetic properties of the composite are determined mainly by the bismuth matrix. Magnetic measurements reveal a magnetic phase with an anisotropy field of more than 200 kOe at 77°K and a Curie point of 240°K. This phase is believed to be a modification of MnBi different from the two already known. The solubility of Mn in solid Bi is concluded to be less than 30 wt ppm.