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The microscopic magnetism in the helical, the conical and theferro-magnetically polarized phases in an itinerant helical magnet, MnSi, hasbeen studied by an extended 29Si NMR at zero field and under external magneticfields. The temperature dependence of staggered moment, M_Q(T), determined bythe 29Si NMR frequency, nu(T), and nuclear relaxation rate, 1/T_1(T) is ingeneral accord with the SCR theory for weak itinerant ferromagnetic metals andits extension. The external field dependence of resonance frequency, nu(H),follows a vector sum of the contributions from atomic hyperfine and macroscopicfields with a field induced moment characteristic to the itinerant magnets. Adiscontinuous jump of the resonance frequency at the critical field, H_c,between the conical and the polarized phases has also been found that suggestsa first order like change of the electronic states at H_c.

Chiral Magnetism in an Itinerant Helical Magnet, MnSi - An Extended 29Si NMR Study -