Quantum Sensing of Spin Fluctuations of Magnetic Insulator Films with Perpendicular Anisotropy
Quantum Sensing of Spin Fluctuations of Magnetic Insulator Films with Perpendicular Anisotropy
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DOI：
10.1103/physrevapplied.15.034031
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发表时间：
2020-09
期刊：
影响因子：
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通讯作者：
Eric Lee-Wong;Jinjun Ding;Xiaoche Wang;Chuanpu Liu;N. McLaughlin;Hailong Wang;Mingzhong Wu;C. Du
中科院分区：
文献类型：
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作者：
Eric Lee-Wong;Jinjun Ding;Xiaoche Wang;Chuanpu Liu;N. McLaughlin;Hailong Wang;Mingzhong Wu;C. Du
氮空位（NV）中心是金刚石中具有光学活性的原子缺陷，已被广泛应用于新兴的量子传感、成像和网络工作，显示出前所未有的场灵敏度和纳米级空间分辨率。这些优势中的许多都来自于它们出色的量子相干性、可控的纠缠和操作的高保真度，从而有机会超越经典对应物。利用这一前沿的量子计量学，我们报告的非侵入性测量的内在自旋波动的磁性绝缘体薄膜的自发出平面磁化。NV弛豫速率的测量场依赖性与磁振子密度和磁性样品的能带结构的变化很好地相关，这是具有挑战性的访问由传统的磁力测量方法。我们的研究结果突出了NV中心在诊断功能磁性元件的噪声环境方面提供的重要机会，为设计下一代，高密度和可扩展的自旋电子器件提供了有价值的信息。
Nitrogen vacancy (NV) centers, optically active atomic defects in diamond, have been widely applied to emerging quantum sensing, imaging, and network efforts, showing unprecedented field sensitivity and nanoscale spatial resolution. Many of these advantages derive from their excellent quantum-coherence, controllable entanglement, and high fidelity of operations, enabling opportunities to outperform the classical counterpart. Exploiting this cutting-edge quantum metrology, we report noninvasive measurement of intrinsic spin fluctuations of magnetic insulator thin films with a spontaneous out-of-plane magnetization. The measured field dependence of NV relaxation rates is well correlated to the variation of magnon density and band structure of the magnetic samples, which are challenging to access by the conventional magnetometry methods. Our results highlight the significant opportunities offered by NV centers in diagnosing the noise environment of functional magnetic elements, providing valuable information to design next-generation, high-density, and scalable spintronic devices.