Abstract Zinc substituted nickel ferrite (Zn x Ni 1 − Fe 2 O 4 ) is investigated under density functional theory (DFT) within the DFT + U approximation for ≤ 0.50, with particular interest in understanding effect of Zn on net magnetization. Using as a reference ZnFe , localization d band proved to have large impact preference occupy either tetrahedral A or octahedral B coordination sites, which...

Over the past decade, transition metal-based ferrite nanostructures, displaying MFe2O4 stoichiometry (M2+ cations, e.g., Mn, Co, Ni and Zn), have been devised examined primarily owing to their promising applications in cancer nanomedicine. Among these multi-functional spinel ferrites, manganese (MnFe2O4) deserves special attention because it unveils exciting magnetic properties, high chemical s...

Compact Type A (CTA) inclusions are extremely melilite-rich (typically ~90 vol%), with moderate amounts of spinel and minor fassaite and perovskite. Because CTAs are one of the major types of coarsegrained inclusions found in CV3 chondrites but have not been thoroughly studied as a group, we have undertaken a comprehensive petrographic, mineralchemical, and trace element study of a large suite ...

Ti valence measurements in MgAl2O4 spinel from calcium-aluminum-rich inclusions (CAIs) by X-ray absorption near-edge structure (XANES) spectroscopy show that many spinels have predominantly tetravalent Ti, regardless of host phases. The average spinel in Allende type B1 inclusion TS34 has 87% Ti. Most spinels in fluffy type A (FTA) inclusions also have high Ti valence. In contrast, the rims of ...

Calculations for the magnetic dipolar contribution to the magnetic anisotropy of BaFeizOie and LaFeiiZnOie M-type and BaFerMn2Oil A-type hexagonal ferrites have been made. Our calculations take into account all the magnetic moments existing within a sphere with a radius of 118 1, from which good eonvergenee is reached. The results for there ferrite# suggest that the strong magnetic enisotropy i...

Perpendicular magnetic anisotropy (PMA) energy up to Ku = 6.1 ± 0.8 MJm−3 is demonstrated in this study by inducing large lattice distortion exceeding 3% at room temperature epitaxially distorted cobalt ferrite Co0.73Fe2.18O4 (001) thin films. Although the film materials include no rare-earth elements or noble metals, observed larger than that of neodymium-iron-boron compounds for high-performa...

Numerous applications of hexagonal ferrites are related to their easy axis or easy plane magnetocrystalline anisotropy configurations. Certain W-type ferrites undergo spin reorientation transitions (SRT) between different anisotropy states on magnetic field or temperature variation. The transition point can be tuned by modifying the chemical composition, which suggests a potential application o...