The effect of tetrahedral site Ni2+ ions in nickel ferrite

Abstract

The anisotropy, ferromagnetic resonance linewidth and g-factor of nickel ferrite may be discussed in terms of the distribution of the cations within the lattice. It is shown that the anisotropy constant K ₁ of A-site Ni²⁺ ions is about 6 × 10⁶ erg cm⁻³ while the temperature variation of both this K ₁, and the resonance linewidth of the nickel ferrite is consistent with an angular dependence of the energy levels of a ground state multiplet for these ions. It is seen that, contrary to previous suggestions, the g-factor is not a simple function of the magnetic moment of the ferrite.