Spin Excitations of Individual Fe Atoms on Pt(111): Impact of the Site-Dependent Giant Substrate Polarization
Spin Excitations of Individual Fe Atoms on Pt(111): Impact of the Site-Dependent Giant Substrate Polarization
复制标题
DOI：
10.1103/physrevlett.111.157204
复制
发表时间：
2013-10-08
影响因子：
8.6
通讯作者：
Wiesendanger, R.
中科院分区：
文献类型：
--
作者：
Khajetoorians, A. A.;Schlenk, T.;Wiesendanger, R.
我们利用非弹性扫描隧道谱和基于密度泛函理论的模拟，证明了单个Fe原子吸附在铂(111)表面上的磁各向异性能的幅度和符号可以通过改变吸附原子的结合位来控制。由于测量到的各向异性的大小非常小，甚至比以前报道的要小一个数量级，所以电子-空穴激发很弱，因此与贵金属表面上发现的相同吸附原子的值相比，自旋激发显示出较长的进动寿命。
We demonstrate using inelastic scanning tunneling spectroscopy and simulations based on density functional theory that the amplitude and sign of the magnetic anisotropy energy for a single Fe atom adsorbed onto the Pt(111) surface can be manipulated by modifying the adatom binding site. Since the magnitude of the measured anisotropy is remarkably small, up to an order of magnitude smaller than previously reported, electron-hole excitations are weak and thus the spin excitation exhibits long lived precessional lifetimes compared to the values found for the same adatom on noble metal surfaces.