Electrical detection of single magnetic skyrmions in metallic multilayers at room temperature
Electrical detection of single magnetic skyrmions in metallic multilayers at room temperature
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DOI：
10.1038/s41565-017-0044-4
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发表时间：
2018-03-01
影响因子：
38.3
通讯作者：
Fert, Albert
中科院分区：
文献类型：
--
作者：
Maccariello, Davide;Legrand, William;Fert, Albert
磁性Skyrmions是一种受拓扑保护的旋转自旋织构，可以通过施加固定手性的相邻自旋之间的不对称交换作用在磁性材料中稳定下来。它们的体积小，再加上对外部扰动的稳健性，使得磁性天窗在新一代存储和逻辑器件中具有潜在的存储位。为此，必须确定它们对器件电传输特性的贡献--然而，现有的演示仅限于低温，主要是具有B20晶体结构的磁性材料。在这里，我们结合伴随的磁力显微镜和霍尔电阻率测量，展示了在室温下对多层薄膜中亚100 nm Skyrmions的电检测。此外，我们还探测和分析了单个天米子的霍尔信号，这表明它是由反常霍尔效应引起的，而拓扑霍尔效应的贡献可以忽略不计。
Magnetic skyrmions are topologically protected whirling spin textures that can be stabilized in magnetic materials by an asymmetric exchange interaction between neighbouring spins that imposes a fixed chirality. Their small size, together with the robustness against external perturbations, make magnetic skyrmions potential storage bits in a novel generation of memory and logic devices. To this aim, their contribution to the electrical transport properties of a device must be characterized-however, the existing demonstrations are limited to low temperatures and mainly in magnetic materials with a B20 crystal structure. Here we combine concomitant magnetic force microscopy and Hall resistivity measurements to demonstrate the electrical detection of sub-100 nm skyrmions in a multilayered thin film at room temperature. Furthermore, we detect and analyse the Hall signal of a single skyrmion, which indicates that it arises from the anomalous Hall effect with a negligible contribution from the topological Hall effect.