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SQUID magnetometry and electron magnetic resonance (EMR) spectroscopy at 9.28 GHz were employed to probe magnetism and surface spin disorder in Fe3O4 nanoparticles. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis showed magnetite particles with size sime8 nm. Magnetization (M) versus temperature studies yielded blocking temperature TBsime 170 K in H= 50 Oe. For T>TB,...
Fe3O4 single crystal nanoparticles were prepared in zero field and in a magnetic field. Fe3O4 with well crystallinity is achieved in a magnetic field. X-ray diffraction, transmission electron microscopy, vibrating sample magnetometer and Mossbauer spectrum analysis have confirmed that the magnetic field results in increasing crystallinity, such as decrease surface spin disorder and cation vacancies...
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