Tuning the magnetocrystalline anisotropy and spin dynamics in CoxZn1-xFe2O4 (0 ≤ x ≤ 1) nanoferrites

Microwave spin resonance investigation on the effect of the post-processing annealing of CoFe2O4 nanoparticles

“…[1][2][3][4][5] The nanocrystalline ferrites have been a subject area of immense potential due to their profound applications in a wide range of interdisciplinary areas such as magnetic resonance imaging, drug delivery, magnetic hyperthermia treatment, spintronics, high-density memory devices, microwave devices, and power transformers. 2,[6][7][8][9][10] To achieve a higher gure of merit in these applications, the properties of magnetic nanoparticles (MNPs) need to be optimized for relevant applications.…”

“…Magneto-crystalline anisotropy strongly depends on the interaction of cations in the A and B sites, which can also be altered by changing the latticeoccupancy state, crystallite size, bond angle and bond length. 7 Pure and doped CoFe 2 O 4 show a variety of novel properties that vary with the nature of the cations, their charge and site occupancy distribution between tetrahedral and octahedral sites. 7,11,15,16 Different experimental methods have been used in the preparation of ferrite nanoparticles such as sol-gel techniques, 13 co-precipitation, 1,17 hydrothermal, 18 microemulsion 19 and combustion methods, 20 etc.…”

“…Among all of these, the coprecipitation method has been widely used as the prepared sample exhibits high crystallinity, homogeneity and good textural properties of the obtained material. 1,7,17 Also, this technique offers an advantage due to its low cost, high-quality production and less time consumption.…”

“…However, most of the research reports limit their discussion to the resonance eld and g-value, which are major imprints of the material characteristics. 7,15,23 Other key spin resonance parameters that can provide a more detailed understanding of the properties of materials required to enhance the performance of the device have rarely been reported in the literature. 7 In the present work, CoFe 2 O 4 MNPs were synthesized by a wet chemical co-precipitation method and post-processing was carried out by annealing the as-prepared CoFe 2 O 4 powder at different temperatures (300-900 C).…”

“…7,15,23 Other key spin resonance parameters that can provide a more detailed understanding of the properties of materials required to enhance the performance of the device have rarely been reported in the literature. 7 In the present work, CoFe 2 O 4 MNPs were synthesized by a wet chemical co-precipitation method and post-processing was carried out by annealing the as-prepared CoFe 2 O 4 powder at different temperatures (300-900 C). A detailed investigation of the microwave resonance behaviour was carried out by a ferromagnetic resonance (FMR) study and the spin resonance parameters were calculated by tting the FMR spectra.…”