ac Susceptometry of 2D van der Waals Magnets Enabled by the Coherent Control of Quantum Sensors
ac Susceptometry of 2D van der Waals Magnets Enabled by the Coherent Control of Quantum Sensors
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DOI：
10.1103/prxquantum.2.030352
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发表时间：
2021-05
期刊：
影响因子：
9.7
通讯作者：
Xin-Yue Zhang;Yu-Xuan Wang;T. Tartaglia;T. Ding;Mason J. Gray;K. Burch;F. Tafti;B. Zhou
中科院分区：
文献类型：
--
作者：
Xin-Yue Zhang;Yu-Xuan Wang;T. Tartaglia;T. Ding;Mason J. Gray;K. Burch;F. Tafti;B. Zhou
精密磁力测量是开发新型磁性材料和器件的基础。最近，金刚石中的氮空位（NV）中心已成为二维货车德瓦耳斯材料静态磁性的一个有前途的探针，能够定量成像与纳米空间分辨率。然而，磁性的动态特性，理解磁相变和实现技术应用的关键，很少在单一的2D晶体实验访问。在这里，我们相干控制NV中心的自旋进动，以实现超灵敏，定量的二维铁磁体的交流阻抗。结合直流磁滞与交流磁化率测量不同的温度，场，和频率，我们照亮的形成，流动性，并在几层CrBr3的磁畴壁的巩固。我们发现，畴壁流动性增强，在CrCrBr3，与最小的减少超过数百千赫兹的激发频率，并受畴形态和局部钉扎的薄片。我们的技术扩展了NV磁力测量的多功能交流和直流磁表征的范围广泛的自旋电子材料在纳米级。
Precision magnetometry is fundamental to the development of novel magnetic materials and devices. Recently, the nitrogen-vacancy (NV) center in diamond has emerged as a promising probe for static magnetism in 2D van der Waals materials, capable of quantitative imaging with nanoscale spatial resolution. However, the dynamic character of magnetism, crucial for understanding the magnetic phase transition and achieving technological applications, has rarely been experimentally accessible in single 2D crystals. Here, we coherently control the NV center’s spin precession to achieve ultra-sensitive, quantitative ac susceptometry of a 2D ferromagnet. Combining dc hysteresis with ac susceptibility measurements varying temperature, field, and frequency, we illuminate the formation, mobility, and consolidation of magnetic domain walls in few-layer CrBr3. We show that domain wall mobility is enhanced in ultrathin CrBr3, with minimal decrease for excitation frequencies exceeding hundreds of kilohertz, and is influenced by the domain morphology and local pinning of the flake. Our technique extends NV magnetometry to the multi-functional ac and dc magnetic characterization of wide-ranging spintronic materials at the nanoscale.