Ferromagnetic domains in BiMn crystallites are found to be easily observed by utilizing plane polarized light in reflection. A crystallite viewed parallel to the c₀ axis shows a characteristic "rick rack" or zigzag pattern of domains as a stable configuration in zero field. Magnetic domain patterns reminiscent of spiral surface growth are observed. The large magneto-optic rotation is thought to be due to the high resistivity of BiMn alloy.
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Roberts et al. (1954) studied this question.
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