Effect of magnesium substitution on the magnetic properties of diluted magnetic spinels Ni_1-xMg_xFe₂O₄

Magnetic Properties of Diluted Spinels Mg<i><sub>x</sub></i>Ni<sub>1−<i>x</i></sub>Fe<sub>2</sub>O<sub>4</sub> Systems: Are Studied by Green’s Functions and Mean Field Theories

“…The curves do not drop at T C as may be expected for a pure ferromagnetic system but have only an inflexion at T N . The values of Néel temperatures found in this work are roughly similar to the values found in reference [7] and [8]. We have compared the results obtained by different theory's.…”

“…A single phase is the transition of paramagnetic phase (PM) to ferrimagnetic (FerriM) phase in the range 0 ≤ ≤1. In this figure, we have included, for comparison, the theoretical results obtained by (HTSE) theory [7], and the experimental results obtained by magnetic measurement [8], The obtained values of the critical temperature by Green's function theory (GFT), show some significant differences.…”

“…The obtained values are given in Table 1. The Green's function results are compared with the results of high temperature series expansion technique (HTSE) [7], and experimental magnetic measurements [8].…”

“…A single phase is the transition of paramagnetic phase (PM) to ferrimagnetic (FerriM) phase in the range 0 ≤ ≤1. The solid squares are the results of (H.T.S.E)[7] theory. The open circles are the results of (G.F.T) theory.…”