Stray-field imaging of magnetic vortices with a single diamond spin
Stray-field imaging of magnetic vortices with a single diamond spin
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DOI：
10.1038/ncomms3279
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发表时间：
2013-07-01
影响因子：
16.6
通讯作者：
Jacques, V.
中科院分区：
文献类型：
--
作者：
Rondin, L.;Tetienne, J-P.;Jacques, V.
尽管几十年来在磁成像方面取得了进展，但获取具有纳米级空间分辨率的直接、定量信息仍然是一个突出的挑战。最近，出现了一种利用钻石中单个氮空位缺陷作为原子尺寸磁强计的技术，有望取得重大进展。然而，该技术应用于磁性纳米结构的有效性仍有待验证。在这里，我们使用扫描氮空位磁力仪来成像磁性涡旋，这是最具标志性的纳米磁性物体之一，因为涡旋核心的尺寸很小(类似于10纳米)。我们报道了三维、矢量和定量测量铁磁方点中涡旋发出的杂散磁场，包括对涡核的检测。我们发现，无论是对于规则的涡旋结构还是对于高阶磁化态，我们都发现与微磁模拟结果非常一致。这些实验使扫描氮空位磁学成为纳米磁学基础研究的一种实用而独特的工具。
Despite decades of advances in magnetic imaging, obtaining direct, quantitative information with nanometre scale spatial resolution remains an outstanding challenge. Recently, a technique has emerged that employs a single nitrogen-vacancy defect in diamond as an atomic-size magnetometer, which promises significant advances. However, the effectiveness of the technique when applied to magnetic nanostructures remains to be demonstrated. Here we use a scanning nitrogen-vacancy magnetometer to image a magnetic vortex, which is one of the most iconic objects of nanomagnetism, owing to the small size (similar to 10 nm) of the vortex core. We report three-dimensional, vectorial and quantitative measurements of the stray magnetic field emitted by a vortex in a ferromagnetic square dot, including the detection of the vortex core. We find excellent agreement with micromagnetic simulations, both for regular vortex structures and for higher-order magnetization states. These experiments establish scanning nitrogen-vacancy magnetometry as a practical and unique tool for fundamental studies in nanomagnetism.