Single-Molecule Magnets: Different Rates of Resonant Magnetization Tunneling in Mn12 Complexes

Abstract

Two new molecular magnets, the dodecanuclear manganese complexes of the type [Mn₁₂ O₁₂ (O₂ CR)₁₆ (H₂ O)₄ ] (known for R = CH₃ , new for R = o-ClC₆ H₄ , o-BrC₆ H₄ ) have contributed to a better quantum mechanical understanding of single-molecule magnets. For instance, appreciable differences in the steps seen in the magnetization hysteresis loops of these high-spin clusters are attributed to changes in the rates of magnetization tunneling from one complex to another.