Magnetic hysteresis up to 80 kelvin in a dysprosium metallocene single-molecule magnet
Abstract
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 [(CpiPr5)Dy(Cp*)]+ (CpiPr5, penta-iso-propylcyclopentadienyl; Cp*, pentamethylcyclopentadienyl), which displays magnetic hysteresis above liquid-nitrogen temperatures. An effective energy barrier to reversal of the magnetization of Ueff = 1541 wave number is also measured. The magnetic blocking temperature of TB = 80 kelvin for this cation overcomes an essential barrier toward the development of nanomagnet devices that function at practical temperatures.
- Publication:
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Science
- Pub Date:
- December 2018
- DOI:
- 10.1126/science.aav0652
- Bibcode:
- 2018Sci...362.1400G
- Keywords:
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- CHEMISTRY