The influence of field- and stress-induced magnetic anisotropy on the magnetoimpedance in nanocrystalline FeCuNbSiB alloys

Abstract

The correlation between magnetic anisotropy and magnetoimpedance has been studied in field- and stress-annealed Fe73.5Cu1Nb3Si13.5B9 ribbons. As-cast and previously nanocrystallized samples were submitted to different annealing conditions (T=500, 530, and 560 °C and tensile stress σ=150 MPa) in order to induce different magnetic anisotropy. The magnetoimpedance ratio [ΔZ/Z] was measured at 3 MHz using a driving current Irms=10 mA. An hysteretic behavior of the magnetoimpedance ratio is observed. This hysteretic behavior is interpreted considering the magnetization process for samples exhibiting different magnetic anisotropies.

Giant Magnetoimpedance in Ti/CoP Plated Wires

“…Similar peak phenomenon was observed in the uniform wires, ribbons and films, which was attributed to the existence of circumferential or transverse anisotropy and the permeability peak around anisotropy field H K (H K % H P ). [3][4][5][6][7][8] It has been found that in the electrodeposited CoP film there is a transition of magnetic anisotropy with regards to the thickness D of CoP: For D < 0:4 mm, the anisotropy is planar. For 0:4 mm < D < 10 mm it is an oblique anisotropy.…”

“…1,2) The GMI effect consists in a magnetic field induced changes in the complex impedance due to the variation of magnetic permeability. Besides of the uniform wires, ribbons and films, [3][4][5][6][7][8] this effect has been observed in inhomogeneous structured materials such as non -magnetic conducting wire plated with magnetic layers and some sandwich films. [9][10][11][12][13][14][15][16][17][18] Large GMI effect occurs at a relative low frequency in BeCu/NiFe, 9) BeCu/CoFeNi, 10) Ag/NiFe 11) and Cu/CoP 12,13) plated wires.…”

Magnetoimpedance Effect in Amorphous Nd<SUB>4</SUB>Fe<SUB>77.5</SUB>B<SUB>18.5</SUB> As Cast Ribbon

“…5,6) Early works on the MI effect are on the nearly non-magnetostrictive FeCoSiB amorphous wires. [4][5][6] The investigation on the MI effect have been quickly extended to amorphous FeCoSiB ribbons 5,7) and Fe based nanocrystalline ribbons/wires such as FeCuNbSiB, [8][9][10] FeZrB 11,12) and permalloy ribbons/wires NiFeMo. 13,14) In the present work, we report the magnetoimpedance effect in the as cast ribbon Nd 4 Fe 77.5 B 18.5 with melt-spun quenching speed of 40 m/s.…”

“…[4][5][6][7][8][9][10][11][12][13][14] The MI effect includes a sensitive change in impedance with the application of a small DC magnetic field. It was suggested that the MI effect strongly depends on the variation in skin depth via the permeability.…”

Magnetoimpedance effect of the Ni80Fe20/Cu composite wires: The influence of DC current imposed on the Cu base

“…9 Except for varying the composition and geometric structure of the materials, many studies employed field or stress annealing to induce circumferential/transverse magnetic domain structure. 10,11 The most commonly used fabrication methods for composite wires, such as RF sputtering, 20 electroplating 17, 21 and chemical plating, 22,23 cannot control well the magnetic structure. Recently, we imposed a DC current during the process of the chemical plating, and it can significantly improve the GMI effect of composite wire.…”