Sapozhnikov Maksim V, Petrov Yuri V, Gusev Nikita S, Temiryazev Alexey G, Ermolaeva Olga L, Mironov Victor L, Udalov Oleg G
Institute for physics of microstructures RAS, 603950 Nizhny Novgorod, Russia.
Radio-physic Department, Lobachevsky State University of Nizhny Novgorod, 603950 Nizhny Novgorod, Russia.
Materials (Basel). 2019 Dec 24;13(1):99. doi: 10.3390/ma13010099.
Multilayer Co/Pt films with perpendicular magnetic anisotropy are irradiated by focused a He ion beam to locally reduce the anisotropy value. The irradiated spots with the diameters of 100 and 200 nm are arranged in square lattices with the periods of 200 and 300 nm. The formation of nonuniform magnetic states within the spots was observed by magnetic force microscopy methods. We use the concentric distribution of the irradiation fluence within the spot to obtain the radial modulation of the anisotropy constant. This allows us to induce magnetic skyrmions during magnetization reversal of the system. The skyrmions remained stable at zero external magnetic field at room temperature. Magnetization hysteresis loops of the samples were investigated by magnetooptical methods and the results are in good agreement with micromagnetic simulations.
具有垂直磁各向异性的多层Co/Pt薄膜被聚焦的氦离子束辐照，以局部降低各向异性值。直径为100和200 nm的辐照点以200和300 nm的周期排列成正方形晶格。通过磁力显微镜方法观察到点内非均匀磁态的形成。我们利用点内辐照通量的同心分布来获得各向异性常数的径向调制。这使我们能够在系统的磁化反转过程中诱导出磁斯格明子。这些斯格明子在室温下的零外磁场中保持稳定。通过磁光方法研究了样品的磁化磁滞回线，结果与微磁模拟结果吻合良好。
