Strong temperature dependence of antiferromagnetic coupling in CoFeB/Ru/CoFeB N. Wiese, T. Dimopoulos, M. Rührig, J. Wecker, G. Reiss, J. Sort and J. Nogués EPL, 78 6 (2007) 67002 Published online: 25 May 2007 DOI: 10.1209/0295-5075/78/67002