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Muon spin rotation (muSR) spectra recorded for manganese silicide MnSi andinterpreted in terms of a quantitative analysis constrained by symmetryarguments were recently published. The magnetic structures of MnSi inzero-field at low temperature and in the conical phase near the magnetic phasetransition were shown to substantially deviate from the expected helical andconical structures. Here, we present material backing the previous resultsobtained in zero-field. First, from simulations of the field distributionsexperienced by the muons as a function of relevant parameters we confirm theuniqueness of the initial interpretation and illustrate the remarkablecomplementarity of neutron scattering and muSR for the MnSi magnetic structuredetermination. Second we present the result of a muSR experiment performed onMnSi crystallites grown in a Zn-flux and compare it with the previous datarecorded with a crystal obtained from Czochralski pulling. We find the magneticstructure for the two types of crystals to be identical within experimentaluncertainties. We finally address the question of a possible muon-inducedeffect by presenting transverse field muSR spectra recorded in a wide range oftemperature and field intensity. The field distribution parameters perfectlyscale with the macroscopic magnetization, ruling out a muon-induced effect.

On the robustness of the MnSi magnetic structure determined by muon spin rotation