Articles you may be interested inGiant magneto-impedance effect in amorphous ferromagnetic wire with a weak helical anisotropy: Theory and experimentThe extraordinarily high ͑up to 800% magnetoimpedance ratio͒ and sensitive magnetoimpedance effect has been found and studied in FeCoNi magnetic tubes electroplated onto CuBe nonmagnetic wire at frequency of about 1 MHz order. Special annealing was done in order to induce magnetic anisotropy. The high harmonic response has been studied, and the harmonics show larger variations with the external magnetic field than the fundamental. This huge sensitivity of the harmonics ͑up to an order of the tens of thousands %/Oe͒ is promising in regard to the increase of the sensitivity of giant magnetoimpedance sensors. To explain the experiment results, we calculated the high frequency transverse susceptibility taking into account the magnetic anisotropy of first and second orders. The susceptibility is extremely high at the points of orientational phase transitions in the magnetic layer which gives rise to strong nonlinear effects.
Lofland, S.; García Miquel, ÁH.; Vázquez, M.; Bhagat, S. (2002). Microwave magnetoabsorption in glass-coated amorphous microwires with radii close to skin depth. Journal of Applied Physics. 92(4): 2058-2063. doi:10.1063/1.1494847 Microwave magnetoabsorption in glass-coated amorphous microwires with radii close to skin depth
͑͒We present the frequency dependence of microwave magnetoabsorption in glass-coated amorphous microwires of (Co 100Ϫx Fe x ) 72.5 Si 12.5 B 15 . The data were taken at room temperature in the frequency range of 1-60 GHz for field up to 15 kOe by either a cavity perturbation technique or a coaxial transmission line. The resulting spectra strongly depend upon the local microwave magnetic and electric fields We have found that we can simulate the spectra using an analytic solution to the problem of electromagnetic scattering from a cylinder. We demonstrate that these unusual spectra can be interpreted in terms of ferromagnetic resonance and antiferromagnetic resonance. However, because the electromagnetic skin depth is comparable to the radius, the resonance and antiresonance field do not follow the conventional equations.
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