Electrical detection of magnetic skyrmions by tunnelling non-collinear magnetoresistance
Electrical detection of magnetic skyrmions by tunnelling non-collinear magnetoresistance
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DOI：
10.1038/nnano.2015.218
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发表时间：
2015-12-01
影响因子：
38.3
通讯作者：
Heinze, Stefan
中科院分区：
文献类型：
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作者：
Hanneken, Christian;Otte, Fabian;Heinze, Stefan
磁性斯格明子是局域非共线自旋纹理，在未来自旋电子学应用中具有很高的潜力(1-12)。斯格明子相已在多种材料中被发现(9,11)，当前研究的重点是准备、检测和操纵单个斯格明子以在设备中实现(6-8)。斯格明子的局部实验表征已通过洛伦兹显微镜 (3) 或使用自旋偏振扫描隧道显微镜 (4,7,12) 进行原子级隧道磁阻测量来进行。在这里，我们报告了磁性斯格明子的微分隧道电导的巨大变化，这是由于它们的非共线性引起的：自旋通道之间的混合局部改变了电子结构，这使得斯格明子在电子上与其铁磁环境不同。我们提出这种隧道非共线磁阻作为斯格明子的可靠全电检测方案，并且可以轻松实现到设备架构中。
Magnetic skyrmions are localized non-collinear spin textures with a high potential for future spintronic applications(1-12). Skyrmion phases have been discovered in a number of materials(9,11) and a focus of current research is to prepare, detect and manipulate individual skyrmions for implementation in devices(6-8). The local experimental characterization of skyrmions has been performed by, for example, Lorentz microscopy(3) or atomic-scale tunnel magnetoresistance measurements using spin-polarized scanning tunnelling microscopy(4,7,12). Here we report a drastic change of the differential tunnel conductance for magnetic skyrmions that arises from their non-collinearity: mixing between the spin channels locally alters the electronic structure, which makes a skyrmion electronically distinct from its ferromagnetic environment. We propose this tunnelling non-collinear magnetoresistance as a reliable all-electrical detection scheme for skyrmions with an easy implementation into device architectures.