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The spontaneous magnetization as a function of temperature is investigatedfor a number of disordered Ni-Fe-Mo and Ni-Fe-W alloys using superconductingquantum interference device magnetometry, with a focus on the low-T behavior aswell as the critical exponents associated with the magnetic phase transition.While the low-T magnetization is found to be well described by Bloch's T^{3/2}law, an extraordinary enhancement of the spin-wave parameter B and the reducedcoefficient B_{3/2}=BT_C ^{3/2} are observed with increasing Fe dilution ascompared to conventional 3d ferromagnets, whereas the critical amplitudes arefound to decrease systematically. Recent locally self-consistent calculationsof finite-temperature spin dynamics in a generic diluted magnet provide anunderstanding in terms of two distinct energy scales associated with weaklycoupled bulk spins in the FM matrix and strongly coupled cluster spins. In viewof similar behaviour observed in diluted magnetic semiconductors and otherferromagnetic alloys, it is proposed that these distinctive featurescorresponding to the three important temperature regimes provide macroscopicindicators of signature effects of spin clustering on magnetization behaviourin disordered ferromagnets.

Signature effects of spin clustering and distribution of spin couplings on magnetization behaviour in Ni-Fe-Mo and Ni-Fe-W alloys