The structural, electronic and magnetic properties of Zn0.95Co0.05O, Zn0.95Fe0.05O and Zn0.90Fe0.05Co0.05O nanoparticles prepared by a sol-gel method are presented and discussed. Xray diffraction and optical analysis indicated that high spin Co ions substitute for the Zn ions in tetrahedral sites. Fe Mössbauer spectroscopy showed the presence of isolated paramagnetic Fe ions in both Fe doped an...

Using density functional theory calculations, we study the electronic and magnetic properties of the p-type monolayer II-VI semiconductors SrX (X = S,Se). The pristine SrS and SrSe monolayers are large band gap semiconductor with a very flat band in the top valence band. Upon injecting hole uniformly, ferromagnetism emerges in those system in a large range of hole density. By varying hole densi...

III-V ferromagnetic semiconductor has attracted great attention as a potential application for spintronics due to a successful demonstration of spin injection from ferromagnetic GaMnAs into semiconductor. A conclusion so far in the GaMnAs system is the maximum incorporation of Mn up to ~ 5% with ferromagnetism below ~110 K. Higher Mn incorporation produces MnAs precipitates, and which has rathe...

Keeping nickel, cobalt and iron in mind, we investigate the origin of the itinerant ferromagnetism. Recent experiments show that the systems should be in an intermediate coupling regime, where the band width and the interaction energy are of the same order of magnitudes. To treat such a situation, we generalize the Gutzwiller approximation. In that, we take account of the effect of the band deg...

The article presents, using Bi doped ZnO, an example of a heavy ion doped oxide semiconductor, highlighting a novel p-symmetry interaction of the electronic states to stabilize ferromagnetism. The study includes both ab initio theory and experiments, which yield clear evidence for above room temperature ferromagnetism. ZnBi(x)O(1-x) thin films are grown using the pulsed laser deposition techniq...

High pressure magnetization and Curie temperature measurements have been performed on several amorphous Y,Ni,-, alloys. The results seem to indicate that ferromagnetism disappears in a rather inhomogeneous way.

Recent theoretical work for Ga1−xMnxN predicts ferromagnetism in this materials system with Curie temperatures above room temperature. Ferromagnetic behavior observed in Ga1−xMnxN is still controversial, as there are conflicting experimental reports owing to the disparity in c

in this work, we define fuzzy soft ($fs$) matrices and theiroperations which are more functional to make theoretical studies inthe $fs$-set theory. we then define products of $fs$-matrices andstudy their properties. we finally construct a $fs$-$max$-$min$decision making method which can be successfully applied to theproblems that contain uncertainties.