论文标题
室温在零场中的室温天空中的交换偏向超薄膜中
Room temperature skyrmions at zero field in exchange-biased ultrathin films
论文作者
论文摘要
我们证明，在室温下，平均直径约60 nm的磁性天空在交换偏见的pt/co/co/co/nife/irmn多层堆栈中稳定在零外部磁场。这是通过对多层堆栈组成的高级优化来实现的，以平衡控制天际大小和稳定性的不同磁能。磁成像既是用磁力显微镜和扫描氮 - 磁化值进行的，后者在零外部磁场下提供明确的测量。在这样的样本中，我们表明交换偏置在数十个MT范围内提供了Skyrmion自旋纹理对中等外部磁场的免疫力，这对于作为内存设备的应用来说是一个重要特征。这些结果建立了交换偏见的多层堆栈，作为基于磁空的有效实现记忆和逻辑设备的有前途的平台。
We demonstrate that magnetic skyrmions with a mean diameter around 60 nm can be stabilized at room temperature and zero external magnetic field in an exchange-biased Pt/Co/NiFe/IrMn multilayer stack. This is achieved through an advanced optimization of the multilayer stack composition in order to balance the different magnetic energies controlling the skyrmion size and stability. Magnetic imaging is performed both with magnetic force microscopy and scanning Nitrogen-Vacancy magnetometry, the latter providing unambiguous measurements at zero external magnetic field. In such samples, we show that exchange bias provides an immunity of the skyrmion spin texture to moderate external magnetic field, in the tens of mT range, which is an important feature for applications as memory devices. These results establish exchange-biased multilayer stacks as a promising platform towards the effective realization of memory and logic devices based on magnetic skyrmions.
