Comparison of magnetic relaxation between Mn12-Ac and Mn12-tBuAc single-molecule magnets Z. Y. Mi, Y. R. Zhou, J. Zhang, J. F. Li, Y. P. Wang and X. H. Song EPL, 117 4 (2017) 47003 Published online: 12 April 2017 DOI: 10.1209/0295-5075/117/47003