Controlling the Spin of Co Atoms on Pt(111) by Hydrogen Adsorption
Controlling the Spin of Co Atoms on Pt(111) by Hydrogen Adsorption
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DOI：
10.1103/physrevlett.114.106807
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发表时间：
2015-03-11
影响因子：
8.6
通讯作者：
Brune, H.
中科院分区：
文献类型：
--
作者：
Dubout, Q.;Donati, F.;Brune, H.
我们利用扫描隧道显微镜研究了 H 吸附对 Pt(111) 上单个 Co 原子磁性的影响。对于原始 Co 原子，我们在隧道光谱中没有检测到非弹性特征。相反，CoH 和 CoH2 在通过同位素取代鉴定的微分电导中显示出许多低能振动特征。 Only the fcc-adsorbed species present conductance steps of magnetic origin, with a field splitting identifying their effective spin as S-eff = 2 for CoH and 3/2 for CoH2.暴露于 H-2 并通过隧道电子解吸允许以半整数步骤可逆地控制自旋。由于表面的存在，氢引起的自旋增加与气相中CoHn分子的自旋顺序相反。
We investigate the effect of H adsorption on the magnetic properties of individual Co atoms on Pt(111) with scanning tunneling microscopy. For pristine Co atoms, we detect no inelastic features in the tunnel spectra. Conversely, CoH and CoH2 show a number of low-energy vibrational features in their differential conductance identified by isotope substitution. Only the fcc-adsorbed species present conductance steps of magnetic origin, with a field splitting identifying their effective spin as S-eff = 2 for CoH and 3/2 for CoH2. The exposure to H-2 and desorption through tunnel electrons allow the reversible control of the spin in half-integer steps. Because of the presence of the surface, the hydrogen-induced spin increase is opposite to the spin sequence of CoHn molecules in the gas phase.