Spin-dimensionality change induced by Co-doping in the chiral magnet Fe1−xCoxSi Lei Zhang, Dirk Menzel, Hui Han, Chiming Jin, Haifeng Du, Jiyu Fan, Min Ge, Langsheng Ling, Changjin Zhang, Li Pi and Yuheng Zhang EPL, 115 6 (2016) 67006 Published online: 07 November 2016 DOI: 10.1209/0295-5075/115/67006