Magnetic hysteresis up to 80 kelvin in a dysprosium metallocene single-molecule magnet.
basic_science · Level V
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- Record sourced from PubMed, PMID 30337456.
- Also identified by DOI 10.1126/science.aav0652.
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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 [(Cp <i><sup>i</sup></i> <sup>Pr5</sup>)Dy(Cp*)]<sup>+</sup> (Cp <i><sup>i</sup></i> <sup>Pr5</sup>, penta-iso-propylcyclopentadienyl; Cp<b>*,</b> pentamethylcyclopentadienyl), which displays magnetic hysteresis above liquid-nitrogen temperatures. An effective energy barrier to reversal of the magnetization of <i>U</i> <sub>eff</sub> = 1541 wave number is also measured. The magnetic blocking temperature of <i>T</i> <sub>B</sub> = 80 kelvin for this cation overcomes an essential barrier toward the development of nanomagnet devices that function at practical temperatures.