Ultrafast spin polarization in a multiferroic manganite BiFe0.5Mn0.5O3 thin film Z. Y. Zhang, Z. M. Jin, X. Lin, Z. X. Cheng, H. Y. Zhao, H. Kimura and G. H. Ma EPL, 112 3 (2015) 37007 Published online: 26 November 2015 DOI: 10.1209/0295-5075/112/37007