Nano-magnetometry using co-resonantly coupled cantilevers

动态悬臂梁磁测量是一种利用振动悬臂梁来研究微米和纳米颗粒和薄膜的磁性的技术。样品被放置在悬臂梁的自由端，样品与外部磁场之间的静磁相互作用导致悬臂梁的振荡状态发生变化。最近，我们开发了一种基于两个具有匹配共振频率的耦合悬臂梁(共振耦合)的新型灵敏传感器装置，并可能在磁力显微镜和悬臂磁测量中应用。在这里，我们提出了共共振耦合纳米线-微悬臂梁传感器系统的建模、制备和实验表征，并将其应用于纳米样品的超高灵敏度悬臂梁磁测量中，例如面内富勒烯的纳米晶体。此外，我们利用我们的传感器在垂直于磁体易轴的静态磁场中，机械地感应并同时分析了单畴磁体中周期性的磁滞反转。

Dynamic cantilever magnetometry is a technique to study magnetic properties of micro- and nanosized particles and thin films by means of an oscillating cantilever beam. The sample is placed at the free end of the cantilever and a magnetostatic interaction between sample and an external magnetic field leads to an alteration of the cantilever’s oscillatory state. Recently, we developed a novel kind of sensitive sensor set-up based on two coupled cantilever beams with matched resonance frequencies (co-resonant coupling) and possible applications in magnetic force microscopy and cantilever magnetometry. Here, we propose the modelling, preparation, and experimental characterization of co-resonantly coupled nanowire-microcantilever sensor systems and their application in ultra-high sensitivity cantilever magnetometry of nanosized samples such as nanocrystals of endohedral fullerenes. Furthermore, we use our sensor to mechanically induce, and at the same time analyze, periodic hysteretic magnetization reversal in single-domain magnets in static magnetic fields perpendicular to the magnet’s easy axis.