Abstract
The transverse incremental permeability and magneto-impedance effects in amorphous Co/sub 66/Fe/sub 4/Ni/sub 1/B/sub 14/Si/sub 15/ ribbons treated with various annealing and etching conditions have been investigated in conjunction with their magnetic anisotropy. The shape and the depth of double peaks in magneto-impedance ratio (MIR) and transverse permeability ratio (TPR) curves show the existence of the uniaxial magnetic anisotropy. The direction of magnetic anisotropy in samples annealed under magnetic field was induced parallel to their magnetic field. The direction of magnetic anisotropy in samples annealed without the magnetic field has changed ribbon to width direction. The surface etching of an as-quenched sample helps to orient the magnetic anisotropy to the ribbon axis. The maximum values of MIR and TPR depend on the magnetic softness rather than the direction of magnetic anisotropy. However, the shapes of MIR and TPR curves strongly depend on their uniaxial magnetic anisotropy.
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