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Hysteresis in Asymmetrical GMI Effect in Amorphous Microwires

100%
Kravčák J.
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vol. 126
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issue 1
132-133
EN
The double-peak behaviour of giant magneto-impedance (GMI) dependence on the external magnetic field strength H is observed in as-cast glass-covered amorphous thin wire Co_{70.5}Fe_{4.5}Si_{15}B_{10} (microwire), as well as in microwire with the removed glass cover. The position of sharp peaks is symmetrical (H=± H_{m}) with respect to zero external magnetic field strength (H=0) and corresponds to the critical field of irreversible magnetization rotation. The maximum GMI ratio (ΔZ/Z)_{max} dependence on the amplitude of current i_{ac} at frequency of 1 MHz is analysed by means of the helical anisotropy (0<α<90°), induced during preparation of the microwire and after glass-cover removing. The additional dc bias current i_{dc} ≤ i_{ac} is applied in order to achieve asymmetrical GMI effect. Asymmetrical GMI dependences exhibit hysteresis which can be explained by irreversible magnetization rotation at ferromagnetic surface of the microwire.
2
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Asymmetric Magneto-Impedance in CoFeSiB Amorphous Microwire

63%
Kravčák J., Varga R.
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issue 5
762-763
EN
The symmetric dependences of magneto-impedance on the applied longitudinal dc magnetic field were measured in an amorphous CoFeSiB microwire. Additional application of a circumferential dc bias magnetic field was used to achieve the asymmetric magneto-impedance in the microwire. The obtained results are theoretically interpreted taking into account the cylindrical core-shell magnetic structure and the helical anisotropy induced during the microwire preparation. The observed very steep linear magneto-impedance dependences crossing H = 0 are promising for technical applications of the CoFeSiB microwire as a sensor of low magnetic fields.
3
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Domain Wall Dynamics in Bistable Ferromagnetic Laminations

63%
Kravčák J., Šuhajová V.
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issue 5
734-735
EN
The presented article deals with a model of magnetic reversal in conducting lamination with a one central ferromagnetic layer and two outer non-ferromagnetic layers. Considering a single rigid 180° domain wall spreading through the axially magnetized ferromagnetic layer the calculation of induced eddy currents in lamination is performed. The dependence of single domain wall mobility on the thickness of ferromagnetic layer is displayed. The effect of non-homogeneous magnetic field intensity generated by eddy currents is also discussed.
4
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Complex Permeability After-Effect and Analysis of Power Losses in Ferromagnetic Co-Based Amorphous Alloy

51%
Kravčák J., Varga R., Vojtaník P.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
43-46
EN
Complex permeability (μ=μ_1-iμ_2) after-effect of near-zero magnetostrictive CoFeCrSiB amorphous alloy was investigated in magnetic field H (t)= H_0exp ( i 2π f t) after demagnetization. For frequencies f from 200 Hz to 2000 Hz and for the small amplitude H_0 < H_{cr} we observed practically constant both realμ_1 and imaginary part μ_2 of permeability. A measured small decrease in the real part μ_1 and increase in the imaginary part μ_2 with frequency f were theoretically calculated for a quadratic form of a domain wall potential E_S (x)=1/2α x^2. The calculated loss factortan δ =μ_2μ_1, which is small at amplitude H_0 < H_{cr}, corresponds to power losses due to eddy currents induced around reversibly moving domain walls.
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