Spin-resolved electron transport through magnetic nanostructures studied by a low-temperature multiprobe-STM

这种自旋电流对样品磁不均匀性的影响是独立完成的。在我们的提议框架中提出的一种更优雅的方法是使用SP-STM装置，该装置在探针尖端具有原子控制的自旋态，该自旋态可以同时用作局部自旋注入器或局部自旋探测。最重要的是，通过使用汉堡小组首创的反铁磁涂层探头尖端，可以消除磁尖杂散场的干扰影响。与平面电极不同的是，反铁磁体的两个相反方向的自旋子晶格的自旋极化效应将相互抵消，而使用原子锐利的反铁磁探针尖端允许前端原子的自旋态主导自旋极化效应。Hamburg小组已经证明，正是前尖原子的自旋态决定了SP-STM成像中的磁对比度和基于SP-STM装置的电流诱导自旋扭矩实验中的自旋注入性质。

influence of such spin currents on the sample's magnetic inhomogeneities are done independently. A much more elegant approach, as proposed in the framework of our proposal, is the use of a SP-STM setup with an atomically controlled spin state at the apex of the probe tip which can simultaneously be used as local spin injector or for local spin probing. Most importantly, the disturbing influence of a magnetic tip's stray field can be eliminated by the use of antiferromagnetically coated probe tips as pioneered by the Hamburg group. In contrast to planar electrodes where the spin polarization effects from the two oppositely oriented spin sublattices of an antiferromagnet would cancel each other, the use of an atomically sharp antiferromagnetic probe tip allows the spin state of the front tip atom to dominate the spin polarization effects. It has already been demonstrated by the Hamburg group that it is indeed the spin state of the front tip atom which determines the magnetic contrast in SP-STM imaging and the spin injection properties in current-induced spin torque experiments based on a SP-STM setup.