Ermolaeva O L, Gusev N S, Skorohodov E V, Petrov Yu V, Sapozhnikov M V, Mironov V L
Institute for Physics of Microstructures RAS, GSP-105, 603950 Nizhny Novgorod, Russia.
Saint Petersburg State University, University Embankment, 7/9, 199034 St. Petersburg, Russia.
Materials (Basel). 2017 Sep 5;10(9):1034. doi: 10.3390/ma10091034.
We present the results of magnetic force microscopy investigations of domain structures in multilayer [Co (0.5 nm)/Pt (1 nm)]₅ thin film structures (denoted hereafter as Co/Pt) modified by additional Co capping layers and by ion irradiation. It is demonstrated that a Co capping layer essentially changes the domain structure and decreases the threshold of magnetization reversal, due to the formation of noncollinear magnetization in Co/Pt. It is shown that local irradiation with a focused He⁺ ion beam enables the formation of regions with decreased easy-axis anisotropy (magnetic bubbles) that have the inverse magnetization direction in the demagnetized state of Co/Pt. The experimental results demonstrate that the magnetic bubbles can be switched using a probe of a magnetic force microscope. The possible application of these effects for the development of magnetic logic and data storage systems is discussed.
我们展示了对多层[Co(0.5纳米)/Pt(1纳米)]₅薄膜结构（以下简称Co/Pt）中磁畴结构进行磁力显微镜研究的结果，该结构通过额外的Co覆盖层和离子辐照进行了改性。结果表明，Co覆盖层由于在Co/Pt中形成了非共线磁化，本质上改变了磁畴结构并降低了磁化反转阈值。结果表明，用聚焦的He⁺离子束进行局部辐照能够形成易轴各向异性降低的区域（磁泡），这些磁泡在Co/Pt的退磁状态下具有相反的磁化方向。实验结果表明，可以使用磁力显微镜的探针来切换磁泡。讨论了这些效应在磁逻辑和数据存储系统开发中的可能应用。
