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The effect of Er 3+ and Y 3+ ion-co-substituted Mn 0.5 Zn 0.5 Er  x  Y  x  Fe 2-2 x  O 4 (MZErYF) ( x ≤ 0.10) spinel nanoferrites (SNFs) prepared by a sonochemical approach was investigated. Surface and phase analyses were carried out using SEM, TEM, and XRD. Hyperfine parameters were determined by fitting room-temperature (RT) Mossbauer spectra. Magnetic field-dependent magnetization data unveiled the superparamagnetic nature at RT and ferrimagnetic nature at 10 K. RT saturation magnetization ( M  S ) and calculated magnetic moments ( n  B ) are 34.84 emu/g and 1.47 μ B , respectively, and have indirect proportionalities with increasing ion content. M  S and n  B data have a similar trend at 10 K including remanent magnetizations ( M  r ). The measured coercivities ( H  C ) are between 250 and 415 Oe. The calculated squareness ratios are in the range of 0.152-0.321 for NPs and assign the multidomain nature for NPs at 10 K. The extracted effective magnetocrystalline constants ( K  eff ) have an order of 10 4 erg/g except for Mn 0.5 Zn 0.5 Er 0.10 Y 0.10 Fe 1.80 O 4 SNFs that has 3.37 × 10 5 erg/g. This sample exhibits the greatest magnetic hardness with the largest magnitude of H  C = 415 Oe and an internal anisotropy field H  a = 1288 Oe among all magnetically soft NPs.

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Structural, Magnetic, and Mossbauer Parameters’ Evaluation of Sonochemically Synthesized Rare Earth Er<sup>3+</sup>and Y<sup>3+</sup>Ions-Substituted Manganese–Zinc Nanospinel Ferrites

Structural, Magnetic, and Mossbauer Parameters’ Evaluation of Sonochemically Synthesized Rare Earth Er3+and Y3+Ions-Substituted Manganese–Zinc Nanospinel Ferrites

Structural, Magnetic, and Mossbauer Parameters’ Evaluation of Sonochemically Synthesized Rare Earth Er³⁺and Y³⁺Ions-Substituted Manganese–Zinc Nanospinel Ferrites