Magnetic properties of amorphous Gd0.67Y0.33

Magnetic phase transition in ferromagnet Co100−xErx () with random anisotropy

“…The curvature in such isotherms becomes more pronounced as the temperature at which a given isotherm is taken deviates more and more from T C . However, in our case the isotherms just below and above T C exhibit the same curvature, as previously observed for semi-disordered systems [27], indicating that nature of the phase transition is slightly different form a classical ferromagnet. Because we do not measure exactly the isotherm for T = T C we obtain the value of δ by interpolating the slopes of the approximately straight parts of the near-critical isotherms for large Ln(H ) [28].…”

Influence of Manganese and Tin Substitution on the Structure and Magnetic Properties of CdCr₂Se₄

“…CdCr 2 Se 4 is a ferromagnetic semiconductor with a Curie temperatures T C ≈ 130K [2]. In CdCr 2 Se 4 the magnetic order results from the competition of nearest neighbors positive Cr-Se-Cr interaction and more distant negative Cr-Se-Cd-Se-Cr exchange interaction [3]. Substitution of the manganese and tin for the divalent cadmium ion therefore causes fundamental changes of magnetic properties.…”