Dielectric and magnetic properties of CoFe2O4 prepared by sol-gel auto-combustion method

Effect of apple cider vinegar agent on the microstructure, phase evolution, and magnetic properties of CoFe2O4 magnetic nanoparticles

“…Moreover, it can be observed that the M s decreases with an increase in the amount of ACV, which can be attributed to decrement of crystallite size from 45 nm for the ACV‐free specimen to ~17 nm for the specimen containing 20 mL ACV. The values of M s obtained for the synthesized specimens are lower than the value of this parameter for bulk ferrite (80 emu/g), which is related to the surface anisotropy energy of nanoscale ferrites . Therefore, the linear decrease in saturation magnetization can be accompanied with an increase in specific surface area.…”

“…Among magnetic nanoparticles (MNPs), the iron oxides and ferrites have attracted the most attention of numerous researchers duo to their wide range of applications in biomedicine, cancer treatment, and etc . CoFe 2 O 4 (CFO) with a cubic inverse spinel structure contains Co 2+ ions distributed at octahedral sites (B) and Fe 3+ ions placed at tetrahedral sites (A) and octahedral sites (B) . Cobalt ferrite has the excellent properties including antibacterial characteristics, low toxicity, low cost, mechanical hardness, large crystalline anisotropy, high coercivity, high Curie temperature, moderate saturation magnetization, and considerable chemical and thermal stability that make it as one of the most practical candidates for biomedical applications.…”

“…CoFe 2 O 4 (CFO) with a cubic inverse spinel structure contains Co 2+ ions distributed at octahedral sites (B) and Fe 3+ ions placed at tetrahedral sites (A) and octahedral sites (B) . Cobalt ferrite has the excellent properties including antibacterial characteristics, low toxicity, low cost, mechanical hardness, large crystalline anisotropy, high coercivity, high Curie temperature, moderate saturation magnetization, and considerable chemical and thermal stability that make it as one of the most practical candidates for biomedical applications. The widespread range of its applications in various industries such as data storage devices, sensitive sensors, high density magnetic recorders, targeted drug delivery systems, electronic devices, magnetic resonance imaging, catalysis, and ferrofluids indicates the importance of this material category.…”

Effect of the CoFe2O4 initial particle size when sintered by microwave on the microstructural, dielectric, and magnetic properties

“…The grain sizes were smaller than those obtained in the FC sample, which presented average grain sizes of 610 and 1920 nm at 1150 and 1250°C, respectively. It has previously been reported 43,44 that the magnetic anisotropy in the CoFe 2 O 4 is related with the incompletely quenched orbital angular momentum of Co 2+ ions, thus the increase in the sintering temperature leads to a reduction in Co 2+ ion anisotropy, decreasing the coercive magnetic. 43,44 It can be observed that considering the increasing sintering temperature, the FC sample (starting submicrometer powder) had the coercive field values reduced by approx.…”

“…The clear reduction observed in the Hc values is mainly attributed to two factors: grain size and magnetic anisotropy. 43,44 It can be observed that considering the increasing sintering temperature, the FC sample (starting submicrometer powder) had the coercive field values reduced by approx. The grain sizes were smaller than those obtained in the FC sample, which presented average grain sizes of 610 and 1920 nm at 1150 and 1250°C, respectively.…”