arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.05770cond-mat.supr-concond-mat.mes-hall
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利用功能化超导探针实现原子尺度自旋极化图

Atomic-scale spin-polarization maps using functionalized superconducting probes

Lucas Schneider, Philip Beck, Jens Wiebe, Roland Wiesendanger

摘要:

具有足够强的自旋极化的磁性尖端的扫描隧道显微镜(STM)可以用于将样品的自旋结构映射到原子尺度,但通常缺乏绝对确定样品的自旋极化值的可能性。超导材料中的磁性杂质产生成对的完美的,即100%自旋极化的子带隙共振。在这项工作中,我们功能化的超导Nb STM尖端的顶点与这样的杂质状态,通过附加Fe原子探测原子操纵的Mn纳米磁体在Nb(110)表面上的自旋极化。通过与自旋极化STM测量相同的纳米磁体使用Cr散装提示比较,我们展示了非凡的自旋灵敏度和定量测量样品的自旋极化值与我们的新功能化探针的可能性。

英文摘要:

A scanning tunneling microscope (STM) with a magnetic tip that has a sufficiently strong spin-polarization can be used to map the sample's spin structure down to the atomic scale but usually lacks the possibility to absolutely determine the value of the sample's spin-polarization. Magnetic impurities in superconducting materials give rise to pairs of perfectly, i.e. 100% spin-polarized sub-gap resonances. In this work, we functionalize the apex of a superconducting Nb STM-tip with such impurity states by attaching Fe atoms to probe the spin-polarization of atom-manipulated Mn nanomagnets on a Nb(110) surface. By comparison with spin-polarized STM measurements of the same nanomagnets using Cr bulk tips we demonstrate an extraordinary spin-sensitivity and the possibility to measure the sample's spin-polarization values quantitatively with our new functionalized probes.

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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