Itinerant Nature of Atom-Magnetization Excitation by Tunneling Electrons
Itinerant Nature of Atom-Magnetization Excitation by Tunneling Electrons
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DOI：
10.1103/physrevlett.106.037205
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发表时间：
2011-01-20
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.;Lounis, S.;Wiesendanger, R.
我们用单原子磁化曲线(SAMC)和非弹性扫描隧道谱(ISTS)测量了单个Fe原子在铜(111)表面的磁化强度。SAMC的磁矩分布很广，平均值为3.5mU(B)。ISTS揭示了一种寿命为200fsec的磁化激发，当施加12T的磁场时，其磁化激发减小到原来的2倍。实验观察用新发展的理论模型所显示的巡游电子系统的磁化激发衰变为斯通纳模进行了定量解释。
We have performed single-atom magnetization curve (SAMC) measurements and inelastic scanning tunneling spectroscopy (ISTS) on individual Fe atoms on a Cu(111) surface. The SAMCs show a broad distribution of magnetic moments with 3.5 mu(B) being the mean value. ISTS reveals a magnetization excitation with a lifetime of 200 fsec which decreases by a factor of 2 upon application of a magnetic field of 12 T. The experimental observations are quantitatively explained by the decay of the magnetization excitation into Stoner modes of the itinerant electron system as shown by newly developed theoretical modeling.