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Room-temperature skyrmions at zero field in exchange-biased ultrathin films
Physical Review Applied ( IF 4.6 ) Pub Date : 
K. Gaurav Rana, A. Finco, F. Fabre, S. Chouaieb, A. Haykal, L. D. Buda-Prejbeanu, O. Fruchart, S. Le Denmat, P. David, M. Belmeguenai, T. Denneulin, R. E. Dunin-Borkowski, G. Gaudin, V. Jacques, and O. Boulle

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.

中文翻译:

交换偏置超薄膜在零场处的室温天空离子

我们证明了平均直径约为 60可以在室温和零外部磁场的情况下,在交换偏置的Pt / Co / NiFe / IrMn多层堆栈中将〜nm稳定下来。这是通过对多层堆栈组成进行高级优化来实现的,以平衡控制天体尺寸和稳定性的不同磁能。磁性成像既可以通过磁力显微镜进行,也可以使用扫描式氮空磁法进行,后者可以在零外部磁场下提供清晰的测量结果。在这样的样本中,我们证明了交换偏压可在数十mT的范围内为天蝎子自旋结构提供适度的外部磁场免疫力,这对于作为存储设备的应用而言是重要的功能。
更新日期:2020-04-01
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