Abstract
The spin wave stiffness D and the phase diagram have been determined for the series of amorphous (FepNi1−p)80P20 alloys, from magnetization data. For applied fields greater than 1 kOe, the magnetization follows the Bloch T3/2 law when corrected for field-induced gap. The coefficient of the T3/2 term diverges as the concentration is reduced towards the critical concentration pc. The effective range parameter D/Tc is also found to diverge, as (p−pc)−1/2. This is consistent with current models for the spin wave stiffness in percolating magnets.
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