Medina Christian D, Mendoza Leonardo A F, Luz-Lima Cleânio, Bruno Antonio C, Araujo Jefferson F D F
Department of Physics, Pontificia Universidade Católica do Rio de Janeiro, Rio de Janeiro 22451-900, RJ, Brazil.
Department of Physics, School of Physics, Faculty of Sciences, Central University of Venezuela-U.C.V., Caracas 1041, Venezuela.
Sensors (Basel). 2025 Apr 19;25(8):2594. doi: 10.3390/s25082594.
We improved a scanning magnetic microscope built previously by adding a new detection system and the capability of mapping samples applying magnetic fields from -500 mT to +500 mT. The mechanical structure was also enhanced to decrease vibrations of the system in the earth's magnetic field. The microscope is based on a differential arrangement of two Hall effect elements. The overall system presented a sensitivity of about 850 nTrms√Hz, and it was calibrated using a 99% pure nickel sphere. The system achieved a magnetic moment sensitivity of the order of 10 nAm. All equipment used for operating the magnetic microscope was controlled by using the LabVIEW platform. We also fabricated samples with controlled properties using iron oxide microparticles and epoxy resin with various densities. We obtained the magnetization curves of the composites using the assembled microscope and compared them with the iron oxide powder.
我们对之前构建的扫描磁显微镜进行了改进，增加了一个新的检测系统，并具备对样品施加从 -500 mT 到 +500 mT 磁场进行成像的能力。还增强了机械结构，以减少系统在地球磁场中的振动。该显微镜基于两个霍尔效应元件的差分配置。整个系统的灵敏度约为 850 nTrms√Hz，并使用 99% 纯镍球进行了校准。该系统实现了约 10 nAm 量级的磁矩灵敏度。用于操作磁显微镜的所有设备均通过 LabVIEW 平台进行控制。我们还使用具有不同密度的氧化铁微粒和环氧树脂制备了具有可控特性的样品。我们使用组装好的显微镜获得了复合材料的磁化曲线，并将其与氧化铁粉末的磁化曲线进行了比较。
