Multifunctional magnetic force microscopy probes

碳纳米管内的铁纳米线(FeCNT)可以被认为是由碳壳在化学和机械上稳定的单晶和单域纳米磁体。附着在传统悬臂梁上的FeCNT构成了单极子状的高分辨率磁力显微镜(MFM)探针。在这里，我们提出了MFM探头设计和相应的操作模式，以实现横向和垂直探头振荡。这些传感器对平行和垂直于样品表面的磁场导数很敏感。更先进的方案包括(I)利用耦合的悬臂梁-纳米管振荡器来提高探头灵敏度的MFM探头，以及(Ii)与通常的场导数灵敏度相反的具有直接场灵敏度的李萨如曲线的探头。

Iron nanowires inside carbon nanotubes (FeCNT) may be considered as single-crystalline and single-domain nanomagnets that are chemically and mechanically stabilized by the carbon shells. FeCNTs attached to conventional cantilevers constitute monopole-like high-resolution magnetic force microscopy (MFM) probes. Here, we propose MFM probe designs and corresponding modes of operation to enable both lateral and perpendicular probe oscillations. These sensors are sensitive to magnetic field derivatives parallel and perpendicular to the sample surface. Even more advanced schemes include (i) MFM probes utilizing coupled cantilever-nanotube oscillators boosting the probe sensitivity and (ii) probes performing Lissajous curves with direct field sensitivity as opposed to usual field derivative sensitivity.