Magnetic properties of the amorphous Fe-Zr-B-Ni alloys annealed below the crystallization temperature

We have studied the magnetic properties of amorphous Fe/sub 83-x/Zr/sub 7/B/sub 10/Ni/sub x/ alloys annealed below the crystallization temperature. Such materials are considered to have a potential for high frequency core material applications because of possibilities of obtaining high effective permeability and low coercive force. The addition of Ni content of approximately 0.5-1.5 at.% was found to be effective in improving the soft magnetic properties. The temperature dependence of magnetization measured by a SQUID magnetometer are found to be in good agreement with the spin wave theory. The spectroscopic splitting g values obtained by ferromagnetic resonance (FMR) experiments increase with increasing Ni content. The values of the spin wave stiffness increases from 62.7 meV /spl Aring//sup 2/ to 95.2 meV /spl Aring//sup 2/ with increasing the concentration of Ni. From these experimental results, the range of the exchange interaction are deduced.