Influence of torsion on the magnetic properties of an amorphous ribbon

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Abstract
Measurements of magnetisation, Matteucci effect, and inverse Widemann effect have been performed on Fe40Ni40P14B6 amorphous ribbons under torsion. Influence of the torsional strain on the magnetic properties of the sample is analysed in two ways. Information about the distribution of the easy directions of magnetisation has been obtained from remanence measurements of magnetisation. Matteucci effect and inverse Widemann effect. The dynamic evolution of magnetisation has beeen deduced from coercive force determination in DC longitudinal and transverse of 'circular' fields, as well as from frequency response in AC fields. The magnetic behaviour of twisted amorphous ribbons seems to be caused by the inhomogeneous arrangements of magnetoelastic anisotropy induced by torsion when the latter is high enough to overcome the initial anisotropy distribution present in the sample. Possibilities of technological applications of the observed properties are also discussed.

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