Ferro-, quasiferro- and antiferromagnetic spin-glass orders in random anisotropy crystalline DyxY1-xAl2 compounds

The nature of the different kinds of magnetic order in the magnetic phase diagram (MPD) of the cubic DyxY1-xAl2 weak random magnetic anisotropy series is clarified. At the spin-glass side of the MPD the system is formed by ''antiferromagnetic spin-glass'' clusters, with random-sign pair correlations (≅25 A size), with randomized net magnetic moments, but correlated over long distances (≅103 A) (cluster-glass). At the quasiferomagnetic side, ferromagnetic-like Bragg peaks persist down to x=0.40, but a first-order phase transition at x≅0.625 signals the borderline for existence of good ferromagnetic order. (orig.)