Magnetic structures in substituted ferrites

Abstract

In this paper the magnetic structures of various substituted ferrites are reviewed. Attention is focused on the more usual case of a local canted state. Several systems and detailed magnetic experiments are listed and discussed. Then experimental phase diagrams (tetrahedral-octahedral iron concentrations) are established to distinguish between different magnetic regions: ferrimagnetic order, local canted state or perturbed magnetic order, spin-glass-like phase and in between intermediate regions.

Morphology, Microstructure, and Magnetic Properties of Ordered Large-Pore Mesoporous Cadmium Ferrite Thin Film Spin Glasses

“…The strong dependence of the material properties on the cation distribution is for example reflected in the variety of magnetic ordering phenomena (ranging from ferrimagnetism to spin glass behavior) that have been observed in the last two decades. [32][33][34] This variety and the fact that the spinel-motif structure enables materials with tailor-made properties to be produced has renewed the interest in spinel ferrites, in particular nanocrystalline forms of these materials.…”

“…forth. [34,[62][63][64] Even though the origin of these effects is not fully understood yet, it is typically attributed to magnetic frustration, (surface) disorder/anisotropy, and finite size effects. From the same data it can be seen that in-plane hysteresis experiments yield slightly higher magnetization values, which indicates that the easy axis for magnetic alignment lies parallel to the plane of the substrate.…”

Synthesis, XRD & SEM Studies of Zinc Substitution in Nickel Ferrites by Citrate Gel Technique

“…It is known that magnetic properties of ferrites are sensitive to preparation technique and their microstructures [7]. The electrical and magnetic properties of such ferrites depend strongly on distribution of cations at the tetrahedral (A) and octahedral (B) sites in the lattice [8][9][10]. It is well known that zinc ions can be used to alter the saturation magnetization.…”

Structural and Magnetic Properties of Dilute Spinel Ferrites: Neutron Diffractometry and Magnetometry Investigations

“…In other words, substitution not only lowers the ordering temperature but also smears the phase transition associated with inhomogeneous short-range ordering [2]. Furthermore, the frustration due to competitive ferromagnetic and antiferromagnetic interactions, which is induced by the substitution, may destroy the long-range order before it reaches the percolation threshold [2,8,9]. Such short-range ordering and magnetic frustrations are correlated with the arrangement of zinc, manganese, and iron ions in the A and B sites.…”