论文标题
具有单个自旋量子磁力计的扫描渐变测定法
Scanning gradiometry with a single spin quantum magnetometer
论文作者
论文摘要
在这里，我们演示了一种渐变技术，可显着增强此类静态场的测量灵敏度，从而在弱磁系统的成像中带来新的机会。我们的方法依赖于扫描钻石探针尖端的单个氮散布中心的机械振荡，该中心将局部空间梯度转换为AC磁场，从而可以使用敏感的AC量子方案。我们表明，渐变学比静态场成像具有重要的优势：（i）刻录顺序更好的灵敏度，（ii）更局部和更清晰的图像，以及（iii）对场漂移的强烈抑制。我们通过成像出现在抗fiferromagnet中的地形缺陷和原子步骤的纳米田，在石墨烯设备中的直流电流以及para-和diamagnetic金属的原子步骤来证明渐变的能力。
Here, we demonstrate a gradiometry technique that significantly enhances the measurement sensitivity of such static fields, leading to new opportunities in the imaging of weakly magnetic systems. Our method relies on the mechanical oscillation of a single nitrogen-vacancy center at the tip of a scanning diamond probe, which up-converts the local spatial gradients into ac magnetic fields enabling the use of sensitive ac quantum protocols. We show that gradiometry provides important advantages over static field imaging: (i) an order-of-magnitude better sensitivity, (ii) a more localized and sharper image, and (iii) a strong suppression of field drifts. We demonstrate the capabilities of gradiometry by imaging the nanotesla fields appearing above topographic defects and atomic steps in an antiferromagnet, direct currents in a graphene device, and para- and diamagnetic metals.
