We have studied the magnetization of melt‐spun amorphous Fe80—y—xNiyMnxB12Si8 alloys with 20 ≤ y(Ni) ≤ 50 and 0 ≤ x(Mn) ≤ 2 under magnetic fields up to 18 kOe, and have analyzed the results at 4.2 K, based on the random magnetic anisotropy (RMA) model. The approach to saturation is established in the form of H—1/2 for the various samples. The exchange constant A and the ferromagnetic correlation length Rf decrease with Mn addition while the local random anisotropy is enhanced.

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Details of an approach for strongly coupled orbital triplet Jahn-Teller (JT) systems using a unitary transformation and energy minimization procedure are applied to the two-mode T0 (e+ e) JT system in the case when both linear and quadratic coupling are included. The inclusion of quadratic JT coupling leads to a partial lift of degeneracy of the triplet ground states and the excited ones. The effect of static strains in strongly coupled T0 (e+ e) JT system is also investigated analytically. We have shown that tetragonal trigonal and orthorhombic strains modify the structure of the system. PACS 71.70 -Level splitting and interactions.

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