Magnetic properties of Mn substituted barium ferrite

Influence of chromium substitution on structural and magnetic properties of BaFe12O19 powder prepared by sol–gel auto combustion method

“…The decrease in the lattice parameters with the addition of chromium is due to replacement of higher ionic radii element Fe 3+ (0.67Å) by smaller ionic radii element Cr 3+ (0.63Å). Similar results were observed by substitution of Fe 3+ (0.67Å) by Mn 3+ (0.645Å) ions in barium hexaferrite [31]. This result shows that the crystal structures of barium hexaferrites were contracted after being doped with Cr 3+ ions.…”

“…More specifically substitution causes weakening of super exchange interaction of type Fe A 3+ -O-Fe B 3+ , leading to collapse of magnetic collinearity of the lattice. The decrease in saturation magnetization and remanence magnetization with substitution of Cr 3+ is closely agrees with the observations made for Al 3+ and Mn 3+ substituted barium hexaferrite prepared by glass ceramic technique and solution combustion technique [31,34,35].…”

Influence of annealing temperature and doping rate on the magnetic properties of Zr–Mn substituted Sr-hexaferrite nanoparticles

“…On the other hand, the coercivity of the samples decreases continuously with the Zr-Mn content. It has been reported that Mn 2+ ions occupy 12k and 2a sites [22] while the Zr 4+ ions replace the iron ions from 2b at low substitution (x = 0.1) and at 4f 1 for higher substitution (x > 0.1) [23]. The electrons in 12k, 2a and 2b sites have spin up direction while in 4f 1 and 4f 2 are spin down.…”

Structural, magnetic and dielectric properties of Cr substituted yttrium iron garnets

“…The estimated value of K 1 is found to increase marginally from (7.94± 0.03)×10 4 erg cm –3 for x = 0 to (8.23± 0.02)×10 4 erg cm –3 for x = 0.5. The K 1 value is found to be one order of magnitude smaller than that reported in ferromagnetic Fe and ferrimagnetic hexaferrites . These values also suggest that these materials are magnetically soft.…”