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

这种自旋电流对样品的磁不均匀性的影响是独立进行的。一个更优雅的方法，我们的建议的框架中提出的，是使用一个SP-STM设置与原子控制的自旋状态的探针尖端的顶点，可以同时用作本地自旋注入器或本地自旋探测。最重要的是，磁性尖端的杂散场的干扰影响可以通过使用汉堡小组率先开发的反铁磁涂层探针尖端来消除。与平面电极相反，其中来自反铁磁体的两个相反取向的自旋子晶格的自旋极化效应将彼此抵消，使用原子级尖锐的反铁磁体探针尖端允许前尖端原子的自旋状态主导自旋极化效应。Hamburg小组已经证明，正是前尖端原子的自旋状态决定了SP-STM成像中的磁衬度和基于SP-STM装置的电流诱导自旋矩实验中的自旋注入特性。

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.