<![CDATA[The purpose of this study is to determine the magnetic properties expressed in the hysteresis loop as well as the morphology of iron sand iron oxide nanoparticles of Logas Village, natural sand, which were doped with Chromium. The separation between magnetic and non-magnetic particles was carried out using the strong magnet Neodymium Iron Boron (NdFeB). Magnetic nanoparticle preparation was carried out by ball milling method for 100 hours which is called BM3 The BM 3 product was divided into three parts with the same amount of weight namely BM 3A, BM 3B and BM 3C. These products was doped with Chromium with concentrations of 0, 10, and 20 (wt%) using ball milling for 20 hours. Magnetic properties were tested using a Vibrating Sample Magnetometer (VSM) and nanoparticle morphology with a Scanning Electron Microscope (SEM). The magnetic properties of the samples were studied based on Loop Hysteresis showed that saturation magnetization (Ms), remanent magnetization (Mr), Coercivity (Hc), Loop Squareness (S), and loop area (A) decreased along with the addition of chromium doping concentration in the sample. The results of the Scanning Electron Microscope (SEM) test showed that as the doping concentration was added to the sample the particle size became smaller, namely 1.316 μm, 1.308 μm, 0.856 μm.]]>
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