Spin chirality of polycrystalline MnSi, or, difficult way from rumours to the solid ground

Six different polycrystalline samples of MnSi were produced as a rapidly frozen melt after the single crystal growth in the Czochralski process. With the help of small-angle scattering of polarized neutrons we show that the magnetic spin chirality being scanned along the sample length oscillates strongly on a scale of 2–3mm, revealing the volumes of the samples with high degree of an enantiomeric excess. The average chirality of the samples deviates from zero value. ► Six different polycrystalline samples of MnSi were produced as a rapidly frozen melt. ► The magnetic spin chirality is shown to be scanned along the sample length. ► The chirality oscillates strongly on a scale of 2–3mm. ► It reveals the volumes of the samples with high degree of an enantiomeric excess. ► The average chirality of the samples deviates from zero value.