Room-temperature helimagnetism in FeGe thin films by Zhang, S, Stasinopoulos, I, Lancaster, T, Xiao, F, Bauer, A, Rucker, F, Baker, A, Figueroa, A, Salman, Z, Pratt, F, Blundell, S, Prokscha, T, Suter, A, Waizner, J, Garst, M, Grundler, D, van der Laan, G, Pfleiderer, C, Hesjedal, T