Magnetic hysteresis up to 80 kelvin in a dysprosium metallocene single-molecule magnet.

Author(s) Guo, F.S.; Day, B.M.; Chen, Y.C.; Tong, M.L.; Mansikkamäki, A.; Layfield, R.A.
Journal Science
Date Published 2018 12 21

Single-molecule magnets (SMMs) containing only one metal center may represent the lower size limit for molecule-based magnetic information storage materials. Their current drawback is that all SMMs require liquid-helium cooling to show magnetic memory effects. We now report a chemical strategy to access the dysprosium metallocene cation [(Cp )Dy(Cp*)] (Cp , penta-iso-propylcyclopentadienyl; Cp pentamethylcyclopentadienyl), which displays magnetic hysteresis above liquid-nitrogen temperatures. An effective energy barrier to reversal of the magnetization of = 1541 wave number is also measured. The magnetic blocking temperature of = 80 kelvin for this cation overcomes an essential barrier toward the development of nanomagnet devices that function at practical temperatures.

DOI 10.1126/science.aav0652
ISSN 1095-9203
Citation Science. 2018;362(6421):14001403.

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