Figure 5

XRD pattern and magnetic hysteresis curves of hybrid microspheres. (A) XRD pattern of (a) γ-Fe2O3/polymer/Au/SiO2 and (B) γ-Fe2O3/Au/SiO2 hybrid microspheres. (B) Magnetic hysteresis curves of the porous γ-Fe2O3/Au/SiO2 hybrid microspheres. The inset is a photograph of the porous γ-Fe2O3/Au/SiO2 microspheres under an external magnetic field.