Jl. Vermeulen et al., RELATION BETWEEN FREQUENCY PERMEABILITY AND STRUCTURAL-PROPERTIES OF CO-FE-SI-B ALLOYS DEPOSITED BY ION-BEAM SPUTTERING, Journal de physique. IV, 2(C3), 1992, pp. 235-238
In the present study, structural properties and microwave permeability
of (Co88Fe9Si3)100-xBx (5 less-than-or-equal-to x less-than-or-equal-
to 15 at.%) films prepared by ion beam sputtering (IBS) were investiga
ted as a function of film composition and deposition parameters. A mic
rocrystalline phase with <111> orientation normal to the film plane is
obtained for low boron content (x < 6at.%) and deposition rate above
2 nm/min, whereas the material is amorphous or partially crystallized
at 1,5 nm/min or for a boron content of 12 at.%. In-plane uniaxial ani
sotropy field H(k) and coercive force H(c) have also been found to be
strongly dependent on deposition rate. For microcrystalline films prep
ared at high growth rate, permeability measurements in the gigahertz r
ange show that gyromagnetic resonance frequency is 1.5 GHz whereas the
real part of relative permeability mu' is 1100 along the hard axis an
d 1 along the easy axis. In contrast amorphous films deposited at low
deposition rate exhibit semihard properties. The complex permeability
spectra shows a low rotational permeability mu'(< 200) combined with a
high resonance frequency more than 3 Ghz. This behavior might be attr
ibuted to the structural inhomogeneities in alloy.