Abstract
The magnetic structure of a single crystal MnSi under applied field has been studied by small angle diffraction with polarized neutrons below TC=28.7 K. Experiments have shown that in zero field the magnetic structure of MnSi consists of four left-handed spiral domains oriented along four <111> axes. The magnetic field, applied along one of the <111> axes, produces a single domain helix oriented along the field at HC1[approximate]80 mT at low temperatures. The magnetic mosaic of the spin structure changes with the magnetic field and has a maximum at HC1. The integral intensity of the Bragg reflection shows a sharp minimum at Hin[approximate]160 mT attributed to an instability of the helix structure. When the field has a component perpendicular to the helix wave vector k, it rotates toward the field direction in the field range H
DOI Link to Publication