Effects of copper content on the structural and magnetic properties of spinel (Co,Cu)Fe2O4 ferrites

Goethite (α-FeOOH) nanopowders synthesized via a surfactant-assisted hydrothermal method: morphology, magnetic properties and conversion to rice-like α-Fe2O3 after annealing

“…Especially for the specimen obtained with 0.4 g CTAB, its H c is about 120 kA/m (~1500 Oe), which is larger than that of some magnetically hard materials. As is well-known, the H c is decided not only by the crystalline structure and chemical composition, but also by the morphology, average crystallite size and so on [32]. Therefore, except for the magnetocrystalline anisotropy, the shape anisotropy also plays an important role in the origination of H c .…”

“…As is well-known, the H c is decided not only by the crystalline structure and chemical composition, but also by the morphology, average crystallite size and so on. 32 Therefore, except for the magnetocrystalline anisotropy, the shape anisotropy also plays an important role in the origination of H c . The H c resulted from the shape anisotropy is tightly related to the demagnetizing factor.…”