Magnetic and dielectric properties of Co–Zn ferrite

ZnFe2O4 Containing Nanoparticles: Synthesis and Magnetic Properties

“…Obviously it is due to higher size of ferrite particles. It is also affirmed by the fact that magnetic properties of thermally treated samples with increased crystallite size are also higher [11], [31]. Also the fact is confirmed [5], [11], that a small additive of Zn (x = 0.2 to 0.4 in formula Me1-xZnxFe2O4) increases saturation magnetization of mixed ferrites.…”

“…It can be seen from the results that the characteristics of mixed ferrite nanopowders synthesised by the sol-gel selfpropagating combustion method are nearly similar to those for nanosized MeZnFe2O4 products, where Me = Co or Ni, obtained by other methods. Products obtained by the chemical co-precipitation method are always a little bit more fine (10-20 nm) [4], [12], but the saturation magnetisation of products obtained by the sol-gel self-propagating combustion method is higher [11]. Obviously it is due to higher size of ferrite particles.…”

“…CoFe2O4 has high permeability in the radio frequency range [6], high thermal stability [7], moderate saturation magnetization [8] and electrical conductivity [9]. It makes them suitable for many technological applications -like microwave devices [10] and telecommunication applications, electric motors and generators, excellent core material for power transformers in electronics, antenna rods, loading coils and read/write heads for high speed digital tape [1], recording tapes and discs [8], high-density information storage and recording devices and as permanent magnets [10], sensors [11] etc. Magnetic nanoparticles and, in particular, magnetic fluids (ferrofluids) have been important for applications in biotechnology and biomedicine -biomedical drug delivery and as contrast agents [11], medical diagnostics [12].…”

“…It makes them suitable for many technological applications -like microwave devices [10] and telecommunication applications, electric motors and generators, excellent core material for power transformers in electronics, antenna rods, loading coils and read/write heads for high speed digital tape [1], recording tapes and discs [8], high-density information storage and recording devices and as permanent magnets [10], sensors [11] etc. Magnetic nanoparticles and, in particular, magnetic fluids (ferrofluids) have been important for applications in biotechnology and biomedicine -biomedical drug delivery and as contrast agents [11], medical diagnostics [12]. Zincsubstituted mixed cobalt ferrites are chosen due to their high sensitivity of magnetization to temperature for some applications like self-controlled hyperthermia [13].…”

“…Zincsubstituted mixed cobalt ferrites are chosen due to their high sensitivity of magnetization to temperature for some applications like self-controlled hyperthermia [13]. Ferrite materials find wide application as catalysts [11] and in photocatalysis (solar radiation-induced photocatalytic hydrogen generation using spinel ZnFe2O4 photocatalysts) [14]. In recent times ferrite materials are used to avoid and remove radio frequency disturbances in audio systems [4], as polarized ferroelectric ceramic in acoustic elements of underwater sound transducers [15] and microwave absorbing materials [16], including ferrite containing radar absorbing colours for disguising military aircraft [17].…”