We have characterized a new Magnetic Force Microscopy (MFM) probe based on aniron filled carbon nanotube (FeCNT) using MFM imaging on permalloy (Py) diskssaturated in a high magnetic field perpendicular to the disk plane. Theexperimental data are accurately modeled by describing the FeCNT probe ashaving a single magnetic monopole at its tip whose effective magnetic charge isdetermined by the diameter of the iron wire enclosed in the carbon nanotube andits saturation magnetization 4 pi M_s ~ 2.2 x 10^4 G. A magnetic monopoleprobe enables quantitative measurements of the magnetic field gradient close tothe sample surface. The lateral resolution is defined by the diameter of theiron wire ~15 nm and the probe-sample separation. As a demonstration, themagnetic field gradients close to the surface of a Py dot in domain and vortexstates were imaged.
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机译：我们已经表征了一种新型的磁力显微镜（MFM）探针，该探针基于填充有铁的碳纳米管（FeCNT），在垂直于磁盘平面的高磁场中在饱和的坡莫合金（Py）磁盘上使用MFM成像。通过描述FeCNT探针在其尖端灰化一个单磁单极子来准确地建立实验数据，该单磁单极子的有效磁荷由碳纳米管中包裹的铁丝的直径及其饱和磁化强度4 pi M_s〜2.2 x 10 ^ 4 G决定。磁单极探头可以定量测量靠近样品表面的磁场梯度。横向分辨率由其导线上约15 nm的直径和探针与样品之间的距离决定。作为演示，对在磁畴和旋涡状态下靠近Py点表面的磁场梯度进行了成像。
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