Figure 1

Fundamental characteristics of the Ni_0.5Zn_0.5Fe₂O₄ ceramic powder synthesized by a solid-state reaction method after the final heat-treatment. (a) XRD pattern of polycrystalline Ni_0.5Zn_0.5Fe₂O₄, (b) FE-SEM and (c) HAADF images of Ni_0.5Zn_0.5Fe₂O₄. The HAADF image was taken with an incident electron beam from [011]. (d) is an enlarged image of (c) with simulated atomic positions (insertion). The simulation was based on a reference²¹. Symbols used are as follows; O (red circles), A-site cations at tetrahedrons (green circles), B-site cations at octahedrons (blue-dashed circles), another B-site cation at octahedron (blue arrow). (e) Simulated diffraction patterns of a spinel-structured ferrite with a thickness of ~ 4.2 nm. (f) Magnetic hysteresis loop of Ni_0.5Zn_0.5Fe₂O₄ ceramic powder measured at room temperature. Inset shows enlarged the vicinity of coercivity.