Critical angles in angular dependent magnetization reversal of exchange biased Co/FeMn bilayers M. Yang, W.B. Rui, J. Pan, X.B. Xue, B. You, W. Zhang, A. Hu and J. Du Eur. Phys. J. B, 85 5 (2012) 158 Published online: 22 May 2012 DOI: 10.1140/epjb/e2012-20985-5