Friedman et al. first observed macroscopic quantum tunneling (MQT) on Mn12-Ac in 1996, the research on single molecular magnets (SMM) such as Mn12-Ac has received much attention.

• Friedman[1]等在测量Mn12-Ac的低温磁效应时发现量子隧穿现象以来，对类似Mn12-Ac的单分子磁体簇合物的研究引起了人们极大的兴趣，成为当前介观物理，磁学，纳米材料等学科的研究热点。