Perpendicular reading of single confined magnetic skyrmions.
Perpendicular reading of single confined magnetic skyrmions.
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DOI：
10.1038/ncomms9541
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发表时间：
2015-10-16
影响因子：
16.6
通讯作者：
Lounis S
中科院分区：
文献类型：
--
作者：
Crum DM;Bouhassoune M;Bouaziz J;Schweflinghaus B;Blügel S;Lounis S
薄膜亚5纳米磁性skyrmions构成了未来数字数据存储的最终缩放选择。Skyrmions是一种强大的非共线自旋纹理，可以通过小电流移动和操纵。在这里，我们在这里展示了一种技术，以检测孤立的nanoskyrmions与当前的椭圆到平面的几何形状，这对设备的概念有直接的影响。我们通过研究磁性准粒子的原子电子结构来探索这种机制背后的物理机制。我们调查从第一原理如何孤立的skyrmion局域态密度隧道到真空中，当与铁磁背景相比，被修改的电子态与不同的相对倾斜角的网站相关的自旋混合。局部输运性质对这种效应很敏感，因为我们报道了Pd/Fe/Ir（111）薄膜中磁skyrmions的原子电导各向异性高达20%。在单个skyrmions中，这种自旋混合磁阻的工程可能会被纳入未来的磁存储技术中。 磁性Skyrmions是一种粒子状结构，它可以出现在具有手性交换相互作用的材料的磁化过程中。在这里，作者演示了如何自旋混合磁阻可以允许可靠的垂直检测单个纳米级skyrmions在Pd/Fe/Ir（111）薄膜。
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. Magnetic skyrmions are particle-like configurations which can emerge in the magnetization of materials possessing a chiral exchange interaction. Here, the authors demonstrate how spin-mixing magnetoresistance can allow for the reliable perpendicular detection of single nanoscale skyrmions in Pd/Fe/Ir(111) thin films.