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arXiv 1306.3318cond-mat.mes-hall
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铁磁和反铁磁单原子接触电导的第一性原理研究

Conductance of Ferro- and Antiferro-magnetic single-atom contacts: A first-principles study

Zhi-Yun Tan, Xiao-long Zheng, Xiang Ye, Yi-qun Xie, San-Huang Ke

摘要:

利用第一性原理研究了由磁性针尖和吸附在磁性表面上的吸附原子组成的五个单原子磁性结的自旋相关电导,Co-Co/Co(001)和Ni-X/Ni(001)(X=Fe,Co,Ni,Cu)结。当自旋组态由铁磁性变为反铁磁性时,自旋向上的电导增大,自旋向下的电导减小。对于含有磁性吸附原子的结,由于自旋向下电导的减小抵消了自旋向上电导的增加,几乎不存在自旋阀效应。对于含吸附原子的Ni-Cu/Ni(001)结,在总电导变化22%的情况下,获得了自旋阀效应。此外,自旋组态的改变增强了Ni-Fe/Ni(001)结的自旋过滤效应,但抑制了其它结的自旋过滤效应。

英文摘要:

We present a first-principles study on the spin denpendent conductance of five single-atom magnetic junctions consisting of a magnetic tip and an adatom adsorbed on a magnetic surface, i.e., the Co-Co/Co(001) and Ni-X/Ni(001) (X=Fe, Co, Ni, Cu) junctions. When their spin configuration changes from ferromagnetism to anti-ferromagnetism, the spin-up conductance increases while the spin-down one decreases. For the junctions with a magnetic adatom, there is nearly no spin valve effect as the decreased spin-down conductance counteracts the increased spin-up one. For the junction with a nonmagnetic adatom (Ni-Cu/Ni(001)), a spin valve effect is obtained with a variation of 22% in the total conductance. In addition, the change in spin configuration enhances the spin filter effect for the Ni-Fe/Ni(001) junction but suppresses it for the other junctions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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