Structural and Magnetic Consequences of Mn0.6Zn0.4Fe2−x Gd x O4 Ferrite

Magnetic and structural properties of single-phase Gd3+-substituted Co–Mg ferrite nanoparticles

“…It should also be noted that doping with low concentrations of REs causes M S to increase, while high dopant concentrations cause M S to decrease. 55 Our results are in good agreement with the theoretical studies of Hou Y. H. et al, 56 who found that the net magnetic moment of CoFe 2 O 4 increased upon doping with Gd 3+ . Yu-Hua et al also showed that the rare earth ions prefer to substitute for Fe 3+ located at octahedral where H C is the coercivity, and M S is the saturation magnetization.…”

“…The saturation magnetization of CoFe 2 O 4 increases upon doping only with Eu and Gd because there are more unpaired 4f electrons for Eu 3+ and Gd 3+ . Similarly, Torkian et al 55 reported that the magnetization of Gd 3+ -doped Mn-Zn ferrite increased for Gd 3+ substitution of up to 15%. The most signicant result of this work is the production of Gd-doped Co-Mg nano-ferrites with magnetization much higher than that of bulk cobalt ferrite.…”

Tuning the Structure, Magnetic, and High Frequency Properties of Sc‐Doped Sr0.5Ba0.5ScxFe12‐xO19/NiFe2O4 Hard/Soft Nanocomposites

“…Thus, these results could lead to achieve the condition of good exchange coupling where the grain size of soft ferrite should be smaller than the domain wall width of hard ferrite by twice or higher. [18,65] The SrBaSc/NiFe H/S (x = 0.035) NCs has the highest values of coercivity, which are 1979.0 Oe at RT and 2236.2 Oe at 10 K, as shown in Tables 2 and 3. However, with inserting the scandium into the NCs, H c declines obviously from 560 to 318.3 Oe at 300 K and from 590.1 to 302.8 Oe at 10 K. This result is related to the Sc 3+ existence as the nonmagnetic cation in the hard SrBaSc phase, which works to low its magnetocrystalline anisotropy and thereby the coercive field of samples.…”

“…[64] In fact, the dominance degree of both exchange and dipolar interactions, the content ratios of soft and hard phases in NCs, as well as the phases' particle sizes principally affect the magnetic features. [65,66] The mixing of the hard (SrBaSc) with the soft (NiFe) ferrites emerges three interactions, which are the H/S exchange interaction, and (soft/soft, hard/hard) dipolar interactions. [64] Thus, the magnetic traits diminish obviously when the dipole/dipole interactions are dominant.…”

New Nanosized (Gd3+, Sm3+) Co-doped Zinc Ferrite for Telecommunication Applications. Magnetic and Structural Properties.

“…In the FTIR spectra of spinel ferrites there are two main characteristic absorption peaks, which are related to intrinsic vibrations of oxygen bonds with metal cations at sites A and B [41].Where the first band is located at 408,87 cm −1 corresponds to the stretching vibrations of the M↔O bond at the octahedral site. And the second located at 563,17 cm −1 is attributed to the vibration of the M↔O bond at the tetrahedral site.…”