Institute of Nanotechnology (INT), KIT , 76021, Karlsruhe, Germany.
Nano Lett. 2014 Jun 11;14(6):3364-8. doi: 10.1021/nl500872c. Epub 2014 May 2.
In spin crossover phenomena, the magnetic moment of a molecule is switched by external means. Here we theoretically predict that several 5d-transition metals (TMs) adsorbed on finite graphene flakes undergo a spin crossover, resulting from multiple adsorption minima, that are absent in the zero-dimensional limit of benzene and the two-dimensional limit of graphene. The different spin states are stable at finite temperature and can be reversibly switched with an electric field. The system undergoes a change in magnetic anisotropy upon spin crossover, which facilitates read-out of the spin state. The TM-decorated nanoflakes thus act as fully controlled single-ion magnetic switches.
在自旋交叉现象中，分子的磁矩可以通过外部手段进行切换。在这里，我们从理论上预测，几个吸附在有限石墨烯薄片上的 5d 过渡金属（TM）会经历自旋交叉，这是在零维极限的苯和二维极限的石墨烯中不存在的。在有限温度下，不同的自旋态是稳定的，可以通过电场可逆地切换。自旋交叉后，体系的磁各向异性发生变化，这有利于读出自旋态。因此，TM 修饰的纳米薄片充当完全可控的单离子磁开关。
