?agneto-impedance (MI) effect in the Fe72Cu1V4Si15B8 amorphous ribbon
obtained by melt spinning method has been studied. The aim of study was the
characterisation of this ribbon in as-cast state in terms of its application
as a MI sensor. The experiments on MI elements were performed in the
frequency range from 30 kHz to 300 MHz and maximum external magnetic field up
to 28.6 kA/m. Maximum observed MI-ratio (?Z = Z(0) - Z(Hmax), Hmax = 28.6
kA/m) has amounted to ?Z/Z(Hmax) = 173% at a frequency of 20.46 MHz. The MI
curve measured up to 20 MHz shows some shoulder indicating the growth of
rotational contribution of magnetization that appears above the domain wall
relaxation frequency. The MI profile at frequencies higher than 30 MHz,
exhibits a clear peak positioned at transverse anisotropy field Hk,
suggesting domination of rotation magnetization in transverse permeability.
The linearity in the range up to 5 kA/m with sensitivity of about 11 %/kA/m
was observed. [Projekat Ministarstva nauke Republike Srbije, br. OI 172057]
?he influence of thermally induced microstructural transformations on
magnetic properties of Fe72Cu1V4Si15B8 ribbon with combined
amorphous/nanocrystalline structure is presented. The experiments showed
that thermally induced structural changes are in correlation with the
appearance of magnetic hysteresis, i.e. with inverted hysteresis loops (IHL)
and exchange bias (EB) effects. It was found that the ratio of surface to
volume of a ribbon sample have an influence on hysteresis loop appearance.
The inverted hysteresis loops were observed for the 1.5 mm wide and 55 ?m
thick alloy samples shorter than 10 mm, but for the samples longer than 10
mm hysteresis loops were normal. With an increase of annealing temperature,
a shift of the hysteresis loops measured at room temperature was noticed.
The highest positive exchange bias field Heb was observed for the sample
annealed at 723 K, together with the lowest magnetic field at which the
changes from inverted to normal hysteresis loop occurred. Annealing at the
temperature of 823 K resulted in negative Heb.
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