Thin-film sub-5 nm magnetic skyrmions constitute an ultimate scaling alternative for future digital data storage. Skyrmions are robust noncollinear spin textures that can be moved and manipulated by small electrical currents. Here we show here a technique to detect isolated nanoskyrmions with a current perpendicular-to-plane geometry, which has immediate implications for device concepts. We explore the physics behind such a mechanism by studying the atomistic electronic structure of the magnetic quasiparticles. We investigate from first principles how the isolated skyrmion local-density-of-states which tunnels into the vacuum, when compared with the ferromagnetic background, is modified by the site-dependent spin mixing of electronic states with different relative canting angles. Local transport properties are sensitive to this effect, as we report an atomistic conductance anisotropy of up to ∼20% for magnetic skyrmions in Pd/Fe/Ir(111) thin films. In single skyrmions, engineering this spin-mixing magnetoresistance could possibly be incorporated in future magnetic storage technologies.
展开▼
机译：小于5纳米的薄膜磁性天rm构成了未来数字数据存储的终极扩展方案。 Skyrmion是坚固的非共线自旋纹理，可以通过小电流对其进行移动和操纵。在这里，我们展示了一种检测具有当前垂直于平面的几何形状的孤立纳米碎片的技术，这对设备概念具有直接意义。通过研究磁性准粒子的原子电子结构，我们探索了这种机制背后的物理学。我们从第一个原理开始研究，与铁磁背景相比，隧穿到真空中的孤立的Skyrmion局部密度状态如何通过具有不同相对倾斜角的电子状态的位置依赖性自旋混合来修改。局部传输特性对此效应很敏感，因为我们报道了Pd / Fe / Ir（111）薄膜中的磁性天体的原子电导各向异性高达〜20％。在单个天体中，对这种自旋混合磁阻进行工程设计可能会纳入未来的磁存储技术中。
展开▼
