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Field-tuned quantum tunneling in two single-molecule magnets coupledantiferromagnetically and formed a supramolecule dimer is studied. We obtainstep-like magnetization curves by means of the numerically exact solution ofthe time-dependent Schr\H{o}dinger equation. The steps in magnetization curvesshow the phenomenon of quantum resonant tunneling quantitatively. The effectsof the sweeping rate of applied field is discussed. These results obtained fromquantum dynamical evolution well agree with the recent experiment[W.Wernsdorferet al. Nature 416(2002)406].Comment: 11 pages, 4 figures, 2 tables. Submited to Phys. Rev.

physical review. b, condensed matter

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Field-tuned quantum tunneling in the supramolecule dimer[Mn4]2