Helimagnetic structure of the FexCo1-xSi alloys

From low-field magnetisation measurements the authors give evidence for the existence of helimagnetism in magnetically ordered FexCo1-xSi alloys. They report small-angle neutron scattering experiments on two samples which are confirmed to be helimagnetic with a helix long period of 430 AA for Fe0.9Co0.1Si and 295 AA for Fe0.8Co0.2Si.