Fe-based Nanocrystalline Ribbons Research Articles

An AFM investigation of the mesostructure of Fe-based nanocrystalline ribbon

The mesostructure at the cross section of the Fe-based nanocrystalline (Fe73.5Cu1Nb3Si13.5B9) ribbon was observed with atomic force microscopy (AFM). An apparent mesostructural difference was found between the sticking roller face area (SRFA) and the free face area (FFA) of the ribbon crystallized after annealing. In SRFA there is a preponderance of rough grain gathering in longitudinal arrangement, while in FFA a fine grain gathering arranged transversely dominates. This phenomenon could be due to the different residual stress remained in the different areas of the amorphous ribbon resulting from the single-roller quenching technique.

Application of Fe-Based Nanocrystalline Ribbon to a Noise Filter and a Shielded Cable

The paper describes the application of Fe-based nanocrystalline alloy ribbon to a common-mode noise filter and a shielded cable in the 10 MHz-1 GHz frequency range. A 0.01-mm-thick Fe-based nanocrystalline alloy ribbon exhibited high permeability and high impedance characteristics. The resistance of a 5.5-mm-diameter roll of Fe-nanocrystalline ribbon (12.5 mm wide and 6 cm long) increased from 1.0 /spl Omega/ at 1 MHz to 5.1 /spl Omega/ at 700 MHz. We confirmed that this filter exhibited the same noise attenuation as a conventional filter (ferrite core) but with 1/20th its volume. Moreover, the noise emission from a twisted pair cable is greatly reduced without any increase in the cable volume by employing the nanocrystalline ribbon as a shielding material.

An AFM investigation of the mesostructure of Fe-based nanocrystalline ribbon

An AFM investigation of the mesostructure of Fe-based nanocrystalline ribbon

Application of Fe-Based Nanocrystalline Ribbons to a Noise Filter

This paper described the application of an Fe-based nanocrystalline ribbons to a noise filter in the 1 MHz ∼ 1 GHz frequency range. A 10-μm-thick Fe76.2Cu1.0Nb2.0Si14.9B5.9 amorphous ribbon was converted into an Fe-based nanocrystalline ribbon by annealing at 500°C∼ 600°C for 10 min. This ribbon exhibited high permeability and high impedance characteristics. It was confirmed that an Fe-based nanocrystalline ribbon noise filter with a 1/18th that of a conventional filter (ferrite core) exhibited the same noise attenuation.

Application of Fe-based nanocrystalline ribbon as a noise filter

The paper describes the application of Fe-based nanocrystalline ribbon to a common-mode noise filter in the 1 MHz/spl sim/1 GHz frequency range. A 10 /spl mu/m thick Fe-based amorphous ribbon was converted into an Fe-based nanocrystalline ribbon by annealing it at 550/spl deg/C for 10 min. The ribbon exhibited high permeability and high impedance characteristics when it was annealed in a transverse magnetic field. The resistance of a 5 mm diameter roll of Fe-nanocrystalline ribbon (12.5 mm wide and 6 cm long) increased from 3 /spl Omega/ at 1 MHz to 10 /spl Omega/ at 1 GHz. We confirmed that this filter exhibited the same noise attenuation as a conventional filter (ferrite core) but with 1/33rd its volume.

The sensitive magnetoimpedance effect in Fe-based soft ferromagnetic ribbons

A comprehensive analysis of magnetoimpedance (MI) phenomena in Fe-based nanocrystalline ribbons is presented in this paper. Giant MI responses have been observed in nanocrystalline samples annealed over the temperature range 490 and . More than 400% increases of the MI ratio were obtained both in and in ribbons. The sensitivity can reach a value larger than in the field range 3 - 7.2 Oe at 800 kHz for ribbons. No MI effect was observed in an as-quenched amorphous sample, because of its very low permeability. A mostly resistive feature was found in an as-quenched amorphous sample. The field dependences of the effective permeability show a typical transverse anisotropy property, and the development of the transverse anisotropy in naturally annealed Fe-based ribbons was analysed.

Comparative study of the giant magneto-impedance effect in Fe-based nanocrystalline ribbons

We report the results of our studies on the giant magneto-impedance effect in nanocrystalline Fe73.5Cu1Nb3Si13.5B9. Fe90Hf7B3, and Fe90Zr7B3 ribbons. The results are explained by taking into account the basic magnetic and electrical properties, and also the domain structures from these ribbons. Our analysis is important from the practical point of view due to the immediate application possibilities offered by the giant magneto-impedance effect.