High Q Single Crystal Cantilevers for Magnetic Resonance Force Microscopy

用于磁共振力显微镜的高 Q 单晶悬臂梁

• 批准号: 9422255
• 负责人: Thomas Kenny
• 金额: $ 32万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-10-01 至 1999-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9422255&HistoricalAwards=false
• 关键词: Single; Crystal; Cantilevers; Magnetic; Resonance

9422255 Kenny This GOALI proposal deals with the fabrication of high Q, single crystal, cantilevers for magnetic resonance force microscopy. These cantilevers are to be fabricated with microelectromechanical sensors (MEMS) technology at the Stanford NNUN facility. The PI plans to fabricate such cantilevers with the goal of improving the force detection sensitivity of a magnetic resonance force microscopy (MRFM) instrument to where atomic resolution may be possible. Through an increase of the quality factor, Q, from 106 to 108 and operation at low temperatures the PI expects to detect forces as low as 10-18 N/Hz1/2, which is several orders of magnitude more sensitive than present MRFM instruments. This would be a fundamental advance in the ability to detect small forces - in fact, the ability to detect magnetic forces from individual nuclear spins. Thus, this work would permit the realization of a micron-scale magnetometer with a ferromagnetic particle on the cantilever tip. The cantilever motion would be excited by the torsional coupling between the ferromagnetic particle's magnetic moment and an external oscillating magnetic field. One of the exciting possibilities of this research lies in the possibility of direct imaging of individual biological molecules (i.e. 'molecular' imaging) which aids in the determination of the molecular structure of molecules. STM and AFM techniques permit 2D "surface' imaging, but this technique could open the door to 3D imaging with the same resolution. The GOALI program will be a collaboration between Stanford and IBM Almaden who have demonstrated a prototype nuclear magnetic resonance (NMR) system. ***

这个GOALI提案涉及用于磁共振力显微镜的高Q单晶悬臂梁的制造。这些悬臂将在斯坦福大学NNUN工厂用微机电传感器（MEMS）技术制造。PI计划制造这样的悬臂梁，目的是提高磁共振力显微镜（MRFM）仪器的力检测灵敏度，使原子分辨率成为可能。通过将质量因子Q从106提高到108，并在低温下工作，PI预计可以检测到低至10-18 N/Hz1/2的力，这比目前的MRFM仪器灵敏几个数量级。这将是探测微小力的能力的一个根本性的进步——事实上，是探测单个核自旋产生的磁力的能力。因此，这项工作将允许实现在悬臂尖端具有铁磁颗粒的微米级磁力计。铁磁粒子的磁矩与外部振荡磁场之间的扭转耦合将激发悬臂运动。这项研究的一个令人兴奋的可能性在于个体生物分子的直接成像的可能性。“分子”成像)有助于确定分子的分子结构。STM和AFM技术允许二维“表面”成像，但这项技术可以为具有相同分辨率的三维成像打开大门。GOALI项目将由斯坦福大学和IBM阿尔马登公司合作进行，后者已经展示了一个核磁共振（NMR）系统的原型。* * *