基于超顺磁纳米颗粒朗之万响应的磁粒子磁强计用于远程磁场传感
Magnetic Particle Magnetometer Based on Langevin Response of Superparamagnetic Nanoparticles for Remote Magnetic Field Sensing
- Oakland University（奥克兰大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
提出一种利用超顺磁纳米颗粒朗之万非线性磁化及二次谐波的新型磁强计，实现远程、非侵入、分布式磁场传感，具有高灵敏度和宽测量范围。
AI中文摘要：
我们展示了一种新型磁强计，该磁强计利用超顺磁纳米颗粒的朗之万非线性磁化作为传感介质。该磁传感器利用磁化响应的偶次谐波，特别是与局部磁场分量成正比的二次谐波。通过远程检测磁化响应，该磁强计无需有线连接即可实现非侵入性、局部化和分布式的磁场传感，且传感体积小，可用于原位生物医学传感、地磁监测、智能诊断和分布式工业传感。在线性工作范围内，磁强计提供±0.2 mT的测量范围和10 pT/√Hz的高灵敏度，而扩展工作模式允许在超过±0.5 mT的范围内进行测量。该传感器提供从直流到几千赫兹的动态带宽，由激励频率决定。
英文摘要：
We demonstrate a novel magnetometer that utilizes the Langevin nonlinear magnetization of superparamagnetic nanoparticles as the sensing medium. The magnetic sensor exploits the even-order harmonics of the magnetization response, particularly the second harmonic, which is proportional to the local magnetic field component. By remotely detecting the magnetization response, the magnetometer enables non-invasive, localized, and distributed magnetic field sensing without requiring wired connections, with a small sensing volume, which can be used for in situ biomedical sensing, geomagnetic monitoring, smart diagnostics, and distributed industrial sensing. In the linear operating regime, the magnetometer provides a measurement range of $\pm$ 0.2 mT and a high sensitivity of 10 pT/$\sqrt{Hz}$, while an extended operating mode allows measurements over a range exceeding $\pm$ 0.5 mT. The sensor offers a dynamic bandwidth from dc up to a few kilohertz, determined by the excitation frequency.
