Helical magnetism in Sr-doped CaMn7O12 films Yazar: Huon, A, Vibhakar, AM, Grutter, AJ, Borchers, JA, Disseler, S, Liu, Y, Tian, W, Orlandi, F, Manuel, P, Khalyavin, DD, Sharma, Y, Herklotz, A, Lee, HN, Fitzsimmons, MR, Johnson, RD, May, SJ