Origin of orbital ferromagnetism and giant magnetic anisotropy at the nanoscale
Origin of orbital ferromagnetism and giant magnetic anisotropy at the nanoscale
复制标题
DOI：
10.1103/physrevlett.96.057206
复制
发表时间：
2006-02-10
影响因子：
8.6
通讯作者：
García, MA
中科院分区：
文献类型：
--
作者：
Hernando, A;Crespo, P;García, MA
讨论了最近在不同的纳米结构薄膜和粒子中观察到的轨道磁性的起源，这是自旋-轨道耦合的结果。结果表明，作为自组装单分子膜的磁区边界，由对称性破坏在薄膜表面产生的接触势导致轨道态，在某些情况下是大半径的。垂直于表面的角动量分量可以达到很高的值，从而通过降低自旋-轨道相互作用能来降低总能量。轨道内铁磁自旋关联导致轨道动量排列。每个原子的磁矩的估计值与在硫醇覆盖的金膜和纳米颗粒中的实验观测结果一致。
The origin of orbital magnetism recently observed in different nanostructured films and particles is discussed as a consequence of spin-orbit coupling. It is shown that contact potentials induced at the thin film surface by broken symmetries, as domain boundaries in self-assembled monolayers, lead to orbital states that in some cases are of large radius. The component of the angular momentum normal to the surface can reach very high values that decrease the total energy by decreasing spin-orbit interaction energy. Intraorbital ferromagnetic spin correlations induce orbital momenta alignment. The estimated values of the magnetic moments per atom are in good agreement with the experimental observations in thiol capped gold films and nanoparticles.