Hs. Gokturk et al., GRANULAR MAGNETIC COMPOSITES EMPLOYING COBALT-BASED AMORPHOUS-ALLOYS IN A POLYMERIC HOST, Journal of applied physics, 73(10), 1993, pp. 5598-5600
Cobalt based soft ferromagnetic amorphous alloys have unique propertie
s which make these materials good candidates to be employed in magneti
c composites prepared by dispersing granules of the alloy in a polymer
ic host. These alloys have excellent soft magnetic properties which ar
e minimally affected by external stresses induced during the processin
g operations involved in the preparation of such a composite. Continuo
us ribbons of a cobalt based amorphous alloy, Metglas 2705M, were cut
into large aspect ratio flakes and blended into a polyethylene host in
volume fractions ranging from 0.001 to 0.15. The relative magnetic pe
rmeability values of the composites increased with increasing volume f
raction of the amorphous alloy, reaching a value of 26 at the volume f
raction 0.15. The magnetic properties of the composites exhibited two
distinguishing features: The permeability values of these composite sa
mples were found to vary only slightly, about 10%, as a function of fr
equency in the range 10 Hz-100 kHz; the samples remained unsaturated u
p to magnetic fields of 5800 A/m. These features are believed to be a
result of the magnetic properties of the composite being heavily influ
enced by the polymeric gaps between the magnetic filler particles.