Nanodots with magnetic vortices have many potential applications, such asmagnetic memories (VRAMs) and spin transfer nano-oscillators (STNOs). Adding aperpendicular anisotropy term to the magnetic energy of the nanodot it becomespossible to tune the vortex core properties. This can be obtained, e.g., in Conanodots by varying the thickness of the Co layer in a Co/Pt stack. Here wediscuss the spin configuration of circular and elliptical nanodots fordifferent perpendicular anisotropies; we show for nanodisks that micromagneticsimulations and analytical results agree. Increasing the perpendicularanisotropy, the vortex core radii increase, the phase diagrams are modified andnew configurations appear; the knowledge of these phase diagrams is relevantfor the choice of optimum nanodot dimensions for applications. MFM measurementson Co/Pt multilayers confirm the trend of the vortex core diameters withvarying Co layer thicknesses.
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机译：具有磁涡流的纳米点具有许多潜在的应用，例如磁存储器（VRAM）和自旋转移纳米振荡器（STNO）。在纳米点的磁能上增加一个垂直各向异性项，就可以调节涡流核心的特性。这可以例如通过改变Co / Pt叠层中Co层的厚度以Conanodots获得。在这里，我们讨论了不同的垂直各向异性的圆形和椭圆形纳米点的自旋结构；对于纳米磁盘，我们证明了微磁模拟和分析结果是一致的。垂直各向异性增加，涡核半径增加，相图被修改并出现新的结构。这些相图的知识与应用中最佳纳米点尺寸的选择有关。 Co / Pt多层膜的MFM测量证实了涡流核直径随Co层厚度的变化而变化的趋势。
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