用于磁场传感的悬浮纳米蹦床谐振器
Levitated nano-trampoline resonators for magnetic field sensing
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中文总结 AI 辅助
研究结合抗磁悬浮与高Q值纳米机械谐振器实现高精度磁力计，用于探测弱振荡磁场。室温无磁屏蔽下，用特定谐振器实现4.5 pT/√Hz峰值磁场灵敏度，受热机械噪声限制，有望实现飞特斯拉级传感，确立其为新型室温高灵敏度磁力计。
中文摘要 AI 辅助
悬浮系统和高Q值薄膜纳米机械谐振器在精密传感中已实现卓越灵敏度，但在不降低其低损耗的情况下将此类谐振器用于实际应用仍具有挑战性。在此，我们将抗磁悬浮与高Q值纳米机械谐振器相结合，以实现用于探测弱振荡磁场的高精度磁力计。一个宏观抗磁悬浮石墨板充当自由浮动的检验质量，它与磁场强烈耦合，将磁场转换为机械运动，并由低损耗纳米蹦床谐振器进行共振放大。在室温且无磁屏蔽条件下，使用在443kHz时机械品质因数Q = 6×10⁶的谐振器，我们实现了4.5 pT/√Hz的峰值磁场灵敏度。系统灵敏度受热机械噪声限制。随着机械Q值的进一步提高，这种混合悬浮平台为飞特斯拉级交流磁场传感提供了一条途径，确立了抗磁悬浮纳米机械谐振器作为一类新型室温高灵敏度磁力计的地位。
英文摘要
Levitated systems and high-$Q$ membrane nanomechanical resonators have achieved exceptional sensitivity in precision sensing, but functionalizing such resonators for practical applications without degrading their low dissipation remains challenging. Here, we combine diamagnetic levitation with a high-$Q$ nanomechanical resonator to realize a high-precision magnetometer for sensing weak oscillating magnetic fields. A macroscopic diamagnetically levitated graphite plate acts as a free-floating proof mass that couples strongly to magnetic fields, converting them into mechanical motion that is resonantly amplified by a low-dissipation nano-trampoline resonator. Operating at room temperature and without magnetic shielding, we achieve a peak magnetic-field sensitivity of $4.5\, \mathrm{pT}/\sqrt{\mathrm{Hz}}$ using a resonator with a mechanical quality factor of $Q=6\times10^{6}$ at $443\, \mathrm{kHz}$. The system sensitivity is limited by thermomechanical noise. With further improvements in mechanical $Q$, this hybrid levitated platform offers a pathway toward femtotesla-level AC magnetic-field sensing, establishing diamagnetically levitated nanomechanical resonators as a new class of high-sensitivity magnetometers at room temperature.
