Mean first-passage times for an ac-driven magnetic moment of a nanoparticle S. I. Denisov, K. Sakmann, P. Talkner and P. Hänggi Europhys. Lett., 76 6 (2006) 1001-1007 Published online: 29 November 2006 DOI: 10.1209/epl/i2006-10403-3