Magnetic hysteresis up to 80 kelvin in a dysprosium metallocene single-molecule magnet
Magnetic hysteresis up to 80 kelvin in a dysprosium metallocene single-molecule magnet
复制标题
DOI：
10.1126/science.aav0652
复制
发表时间：
2018-12-21
期刊：
影响因子：
56.9
通讯作者：
Layfield, Richard A.
中科院分区：
文献类型：
--
作者：
Guo, Fu-Sheng;Day, Benjamin M.;Layfield, Richard A.
仅包含一个金属中心的单分子磁体（SMM）可能代表了基于分子的磁性信息存储材料的尺寸下限。它们目前的缺点是所有 SMM 都需要液氦冷却才能显示磁记忆效应。我们现在报告了一种获取镝茂金属阳离子 [(Cp-iPr5)Dy(Cp*)](+)（Cp-iPr5，五异丙基环戊二烯基；Cp*，五甲基环戊二烯基）的化学策略，该阳离子在液氮温度以上表现出磁滞现象。还测量了 U-eff = 1541 波数磁化反转的有效能垒。该阳离子的磁阻温度 T-B = 80 开尔文，克服了开发在实际温度下工作的纳米磁体器件的一个重要障碍。
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-iPr5)Dy(Cp*)](+) (Cp-iPr5, penta-iso-propylcyclopentadienyl; Cp*, pentamethylcyclopentadienyl), which displays magnetic hysteresis above liquid-nitrogen temperatures. An effective energy barrier to reversal of the magnetization of U-eff = 1541 wave number is also measured. The magnetic blocking temperature of T-B = 80 kelvin for this cation overcomes an essential barrier toward the development of nanomagnet devices that function at practical temperatures.