Structure and soft magnetic properties of single-domain Mg$_{1-x}$Ni$_x$Fe$_2$O$_4$ ($0 \le x \le 1.0$) nanocrystals

M. A. Kassem; A. Abu El-Fadl; A. M. Hassan; A. M. Gismelssed; H. Nakamura

doi:10.1016/j.mseb.2021.115494

paper

Structure and soft magnetic properties of single-domain Mg $_{1 - x}$ Ni $_{x}$ Fe $_{2}$ O $_{4}$ ( $0 \leq x \leq 1.0$ ) nanocrystals

arXiv:2012.13819 · doi:10.1016/j.mseb.2021.115494

Abstract

The effects of Ni $^{2 +}$ substitution on the structure (lattice parameters, cations distribution, average cations radii, cation-cation/anion bond lengths and angles) and the soft magnetic properties of Mg $_{1 - x}$ Ni $_{x}$ Fe $_{2}$ O $_{4}$ ( $0 \leq x \leq 1.0$ ) nanocrystals have been studied by x-ray diffraction with Rietveld refinement, transmittance electron microscopy, Mossbauer spectroscopy and magnetization measurements. The mostly inverse spinel structure was found in MgFe $_{2}$ O $_{4}$ nanoparticles and the inversion factor is further increased by Ni-substitution up to a complete inversion in NiFe $_{2}$ O $_{4}$ . The synthesized ferrites with a small particle size (20 - 30 nm) exhibit soft magnetic properties of a single-domain behavior with critical domain size about 30 - 40 nm. An observed monotonic increase in magnetization and drastic decrease in coercivity at 5 K by Ni-substitution result in a lowest anisotropy constant Ku (2.8 kJ/m3) for x = 0.5. We discuss the evolution of magnetic properties by Ni-substitution in a correlation with a subsequent cations-redistribution between sites of the two sublattices and corresponding structural changes in the inter-ionic distances.

23 pages, 7 captioned figures, 6 tables

Structure and soft magnetic properties of single-domain Mg1−x​Nix​Fe2​O4​ (0≤x≤1.0) nanocrystals

Abstract

References in corpus (3)

Structure and soft magnetic properties of single-domain Mg $_{1 - x}$ Ni $_{x}$ Fe $_{2}$ O $_{4}$ ( $0 \leq x \leq 1.0$ ) nanocrystals