Spin-dependent electronic and magnetic properties of Co nanostructures on Pt(111) studied by spin-resolved scanning tunneling spectroscopy
Spin-dependent electronic and magnetic properties of Co nanostructures on Pt(111) studied by spin-resolved scanning tunneling spectroscopy
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自旋分辨扫描隧道光谱研究 Pt(111) 上 Co 纳米结构的自旋相关电子和磁性特性
DOI：
10.1103/physrevb.74.195411
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发表时间：
2006
影响因子：
3.7
通讯作者：
R. Wiesendanger
中科院分区：
文献类型：
--
作者：
F. Meier;K. Bergmann;P. Ferriani;J. Wiebe;M. Bode;K. Hashimoto;S. Heinze;R. Wiesendanger
在低温下对Co纳米结构进行了自旋分辨扫描隧道谱测量。在Co单层岛和线上，由于Co原子局域堆积的变化，电子结构在几个原子的尺度上发生了变化。用第一性原理计算了赝形fcc和hcp堆积的Co单分子膜的主要光谱特征为少数自旋性质的类表面共振，这种共振由于与铂衬底的不同耦合而发生了能量转移。尽管Co单分子膜具有非均匀的电子结构，但可以清楚地观察到平面外的磁化区域。虽然在导线上测量的磁化壁宽小于磁化壁宽，但对于基本长度最大为磁化壁宽15倍的岛屿，磁化方向没有改变的迹象。此外，还观察到了平面外磁化的Co单层和双层纳米结构的磁滞回线。虽然单层纳米结构的矫顽力大约是，但双层岛显示出令人惊讶的大矫顽力，超过。
Spin-resolved scanning tunneling spectroscopy measurements at low temperatures were performed for Co nanostructures on. On Co monolayer islands and wires the electronic structure changes on the scale of a few atoms due to the changing local stacking of the Co atoms. First-principles calculations for pseudomorphic fcc and hcp stacked Co monolayers assign the dominant feature in the measured spectra to a-like surface resonance of minority-spin character which shifts in energy because of a different coupling to the Pt substrate. Despite the heterogeneous electronic structure of the Co monolayer, the out-of-plane magnetized domains are clearly observed. While the domain wall width measured on wires is less thanthere is no indication for a change in the magnetization direction for islands with a base length up to fifteen times the domain wall width. Furthermore, the magnetic hysteresis in an ensemble of out-of-plane magnetized Co monolayer as well as double-layer nanostructures was observed. While the coercivity for the monolayer nanostructures is about, double-layer islands show surprisingly large coercivities of more than.