论文标题
使用功能化超导探针的原子尺度自旋图图
Atomic-scale spin-polarization maps using functionalized superconducting probes
论文作者
论文摘要
具有足够强的自旋偏振的磁尖端的扫描隧道显微镜（STM）可以用来将样品的自旋结构绘制到原子尺度上，但通常缺乏绝对确定样品自旋极化值的可能性。超导材料中的磁杂质可产生成对的完美成对，即100％自旋偏置亚漏的共振。在这项工作中，我们通过连接Fe原子以探测NB（110）表面上的原子操纵Mn纳米磁体的自旋极化，从而使超导NB STM TIP的顶端具有这种杂质状态。通过使用CR散装尖端对同一纳米磁体的自旋偏振STM测量进行比较，我们证明了具有非凡的自旋敏感性，并且有可能用我们的新功能化探针定量测量样品的自旋偏振值。
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.
