Highly Efficient Thermal and Light-Induced Spin-State Switching of an Fe(II) Complex in Direct Contact with a Solid Surface
Highly Efficient Thermal and Light-Induced Spin-State Switching of an Fe(II) Complex in Direct Contact with a Solid Surface
复制标题
DOI：
10.1021/acsnano.5b02840
复制
发表时间：
2015-09-01
期刊：
影响因子：
17.1
通讯作者：
Kuch, Wolfgang
中科院分区：
文献类型：
--
作者：
Bernien, Matthias;Naggert, Holger;Kuch, Wolfgang
自旋交叉（SCO）复合物具有对温度变化或光激发敏感的自旋态。这些效应已经在固体和溶液中得到了很好的研究，而技术应用需要分子在表面的固定和接触，这通常会导致SCO的抑制。本文报道了[Fe（bpz）（2）phen]分子与高度取向的热解石墨表面直接接触时的热和光诱导SCO。我们能够通过在T=6K下用绿色光照射来开启分子的磁矩，并且通过将温度增加到65K来关闭分子的磁矩。光诱导的开关过程是非常有效的，导致一个完整的自旋转换从低自旋到高自旋状态内的亚单层的分子。固定在弱相互作用石墨衬底上的[Fe（bpz）（2）phen]配合物是实现自旋电子器件的光控分子逻辑单元的理想的候选者。
Spin crossover (SCO) complexes possess a bistable spin state that reacts sensitively to changes in temperature or excitation with light. These effects have been well investigated in solids and solutions, while technological applications require the immobilization and contacting of the molecules at surfaces, which often results in the suppression of the SCO. We report on the thermal and light-induced SCO of [Fe(bpz)(2)phen] molecules in direct contact with a highly oriented pyrolytic graphite surface. We are able to switch on the magnetic moment of the molecules by illumination with green light at T=6K, and off by increasing the temperature to 65K. The light-induced switching process is highly efficient leading to a complete spin conversion from the low-spin to the high-spin state within a submonolayer of molecules. [Fe(bpz)(2)phen] complexes immobilized on weakly interacting graphite substrates are thus promising candidates to realize the vision of an optically controlled molecular logic unit for spintronic devices.