Low temperature magnetization in nanocrystalline Fe88Zr7B4Cu1 alloy

We report here on the effect of annealing temperatures on the spin wave excitations for the nanocrystalline Fe88Zr7B4Cu1 alloy, observed from the low temperature magnetization curve and the spectroscopic splitting g factor. The thermomagnetization curve at low temperature is found to obey the Bloch law, M(sub s)(T) = M(sub s)(0)(1 - BT(super 3/2) - CT(super 5/2). From these experimental results, spin wave stiffness constants within the annealing condition were calculated. In addition, effective permeability, coercive force, saturation magnetization (B10), magnetostriction and magnetic anisotropy of the annealed alloys have been studied systematically.