Thermal and current-induced magnetization reversal in antiferromagnetic nanostructures

在这个项目中，我们将研究反铁磁纳米颗粒中热和电流诱导磁化反转的基本物理过程。为了实现这一目标，我们将开始研究热致开关事件及其对参数的依赖性，如颗粒尺寸和样品温度。在确定了阻断温度之后，我们将通过实验观察纳米颗粒的开关速率在多大程度上被高达几微安的非常高的隧穿电流所改变。特别注意的是结构特性和缺陷的潜在影响，如岛屿，扭结和吸附物的形状。最后，在第三年，我们将研究是否可以通过对磁性和非磁性吸附原子的原子操作来有意地修改和最大化电流诱导的自旋扭矩，这可以用于在纳米尺寸的物体中创建量子谐振器。

In this project we will investigate the underlying physical processes of thermal and current-induced magnetization reversal in antiferromagnetic nanoparticles. Towards this goal we will start with studies of thermally induced switching events and their dependence on parameters such as particles size and sample temperature. After determining the blocking temperature, we will experimentally observe to what extend the switching rate of nanoparticles is modified by very high tunneling currents up to several micro-Ampere. Particular attention will be paid to the potential influence of structural properties and defects, such as the shape of islands, kinks, and adsorbates. Finally, in the third year we will investigate if the current-induced spin-torque can be intentionally modified and maximized by atomic manipulation of magnetic and non-magnetic adatoms, which can be used to create quantum resonators in nano-sized objects.