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Buznikov, N.A.,Yoon, S.-S.,Kim, C.-O.,Kim, C. IEEE 2005 IEEE transactions on magnetics Vol.41 No.10
The off-diagonal magnetoimpedance in field-annealed Co-based amorphous ribbons was measured using a pick-up coil wound around the sample. The influence of the current amplitude on the first and second harmonics in the pick-up coil voltage was studied. The second harmonic contribution to the voltage increases with the current amplitude, and at sufficiently high current amplitudes, the amplitude of the second harmonic becomes higher than that of the first harmonic. The asymmetric two-peak behavior of the field dependences of the harmonic amplitudes was observed, which is related to the coupling between amorphous bulk and surface crystalline layers appearing after annealing. The experimental results are interpreted in terms of a quasi-static rotational model.
Generation of second harmonic in off-diagonal magneto-impedance in Co-based amorphous ribbons
Buznikov, N A,Yoon, S S,Jin, L,Kim, C O,Kim, C G Institute of Physics [etc.] 2006 Journal of physics. D, applied physics Vol.39 No.2
<P>The off-diagonal magneto-impedance in Co-based amorphous ribbons was measured using a pick-up coil wound around the sample. The ribbons were annealed in air or in vacuum in the presence of a weak magnetic field. The evolution of the first and second harmonics in the pick-up coil voltage as a function of the current amplitude was studied. At low current amplitudes, the first harmonic dominates in the frequency spectrum of the voltage, and at sufficiently high current amplitudes, the amplitude of the second harmonic becomes higher than that of the first harmonic. For air-annealed ribbons, the asymmetric two-peak behaviour of the field dependences of the harmonic amplitudes was observed, which is related to the coupling between the amorphous phase and surface crystalline layers appearing after annealing. For vacuum-annealed samples, the first harmonic has a maximum at zero external field, and the field dependence of the second harmonic exhibits symmetric two-peak behaviour. The experimental results are interpreted in terms of a quasi-static rotational model. It is shown that the appearance of the second harmonic in the pick-up coil voltage is related to the anti-symmetrical distribution of the transverse field induced by the current. The calculated dependences are in qualitative agreement with the experimental data.</P>