The results of macroscopic magnetization measurements for 2.5°K < T< 900°K and H< 20 kOe, and neutron diffraction studies, on powder and single crystal MnSi are reported. The magnetization measurements are not compatible with zero‐field ferromagnetism below the ordering temperature. An antiferromagnet ⇒ spin‐flop ⇒ saturated paramagnet behavior typical of simple antiferromagnets for T≦TN is observed upon increasing H at low temperatures. χ⊥ is nearly constant in the ordered state, and χinitial = 2χ⊥/3 for powdered material. However, in neither powder nor single‐crystal neutron‐diffraction experiments were any additional magnetic reflections observed. Below 30°K certain nuclear reflections consistent with spontaneous zero field ferromagnetism increase in intensity. The depolarization of polarized neutrons transmitted through a polycrystalline sample suggests that MnSi is neither a simple ferromagnet nor a simple antiferromagnet.
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Levinson et al. (1973) studied this question.