AI Article Synopsis
- Magnetic FeO nanoparticles were uniformly dispersed with varying SiO coating thickness, and their structural and magnetic properties were analyzed using advanced techniques like X-ray diffraction and electron microscopy.
- Scanning electron microscopy revealed a nonporous core-shell structure of silica coatings on the FeO nanoparticles, which helped control their agglomeration through electrostatic interactions.
- The study found that at room temperature, the magnetic coercivity of the SiO@FeO nanocomposites was significantly higher than that of thin films and other nanoparticles, and the Stoner-Wohlfarth model was used to explain the observed hysteresis effects related to different iron oxidation states.
Article Abstract
In this study, magnetic FeO nanoparticles (NPs) were dispersed uniformly by varying the thickness of the SiO coating, and their electronic and magnetic properties were investigated. X-ray diffraction confirmed the structural configuration of monophase inverse-spinel FeO NPs in nanometer size. Scanning electron microscopy revealed the formation of proper nonporous crystallite particles with a clear core-shell structure with silica on the surface of FeO NPs. The absorption mechanism studied through the zeta potential indicates that SiO-coated FeO nanocomposites (SiO@FeO NCs) possess electrostatic interactions to control their agglomeration in stabilizing suspensions by providing a protective shield of amorphous SiO on the oxide surface. High-resolution transmission electron microscopy images demonstrate a spherical morphology having an average grain diameter of ∼11-17 nm with increasing thickness of SiO coating with the addition of a quantitative presence and proportion of elements determined through elemental mapping and electron energy loss spectroscopy studies. Synchrotron-based element-specific soft X-ray absorption spectroscopy and X-ray magnetic circular dichroism (XMCD) techniques have been involved in the bulk-sensitive total fluorescence yield mode to understand the origin of magnetization in SiO@FeO NCs. The magnetization hysteresis of FeO was determined by XMCD. At room temperature, the magnetic coercivity () is as high as 1 T, which is about 2 times more than the value of the thin film and about 5 times more pronounced than that of NPs. For noninteracting single-domain NPs with the spread from 1 to 3 T, the Stoner-Wohlfarth model provided an intriguing explanation for the hysteresis curve. These curves determine the different components of Fe oxides present in the samples that derive the remnant magnetization involved in each oxidation state of Fe and clarify which Fe component is responsible for the resultant magnetism and magnetocrystalline anisotropy based on noninteracting single-domain particles.
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| http://dx.doi.org/10.1021/acs.langmuir.3c01222 | DOI Listing |
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