Abstract
The SmCo5 nanoflakes covered with polyvinylpyrrolidone (PVP) surfactant are obtained via surfactant-assisted ball milling method and were treated by ligand-exchange and vacuum heat-treatment methods. No significant change in the phase structure and surface morphology of as-milled SmCo5 nanoflakes was found upon those as confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis, respectively. Moreover, X-ray photoelectron spectroscopy (XPS) analysis revealed that the ligand-exchange and vacuum heat-treatment are effective techniques for removing the polyvinylpyrrolidone (PVP) surfactant from the surface of SmCo5 nanoflakes. Meanwhile, the mechanism of coercivity is studied by the temperature dependence of demagnetization curves, which indicates that the magnetization reversal is controlled by co-existed mechanisms of pinning and nucleation.
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