Recent improvement of hard ferrite permanent magnets based on La–Co substitution

Influence of the iron content on the formation process of substituted Co–Nd strontium hexaferrite prepared by the citrate precursor method

“…Extrapolating M vs. 1/H to 1/H = 0 we find that the saturation magnetization is M S = 91 emu/g. This is a high value of saturation magnetization for this phase, as compared to other authors' results who find M S = 45 emu/g [8]; 65 emu/g [9] and 73 emu/g [10] for Sr ferrite with La-Co substitution. The values of magnetization for samples S0, SS and SM and are not conclusive since these samples are not single-phase but contain hematite, which inhibits to determine the magnetization of the ferrite itself.…”

“…These are very high coercivities for Sr ferrite, as compared to values of 3400 Oe with La, Gd and Er substitution [8], 4400 Oe [9,11] and 5000 Oe [10] with La-Co substitution.…”

Microstructure and magnetic microstructure of La + Co doped strontium hexaferrites

“…It was found, however, that either the saturation magnetization M s , or the anisotropy field H A , or both decrease. It was noticed that improved properties could be achieved by simultaneous doping with La and Co [12,13]. Some techniques such as nuclear magnetic resonance (NMR) [12] and Mossbauer [14,15] Magnetic force microscope (MFM) is a powerful instrument to investigate the crystalline and magnetic microstructures of magnetic materials partially due to its high lateral resolution and capability of capturing the crystalline microstructure images and corresponding magnetic microstructure images simultaneously.…”

Magnetic Properties of Nano-Crystalline Barium Ferrite Synthesized by Different Synthesis Route

“…In order to achieve this purpose, element substitution was widely used for the synthesis of magnetic materials with appropriate saturation magnetization and coercivity [8][9][10][11][12][13].…”