抄録
Relation between soft magnetic properties and local anisotropy fluctuation in Fe-Ni-Nb alloy films measured by the dynamic differential susceptibility method was clarified and discussed in comparison with Fe-Si-Al alloy films. In Fe-Ni-Nb alloy films, excellent soft magnetic properties, μeff=6500 at 5 MHz of 1000Å film thickness, were realized. In Fe-Si-Al alloy films, the magnitude of μeff is proportional to 1/√S (S: structure constant) and independent of the value of HK, while in Fe-Ni-Nb alloy films, the value of S is about one tenth of that in Fe-Si-Al alloy films, and the magnitude of μeff is not dependent on the value of S. Rather, this magnitude is dependent on the value of Hk, and is almost equal to 4πMs/Hk (obtained from a rotational magnetization model in a uniaxal single domain particle).
