Demagnetizing Factors for Various Geometries Precisely Determined Using 3-D Electromagnetic Field Simulation

“…2b) can be ascribed to this demagnetization effect and the generation of complex closure domain structures at the ends of the ribbons for reduced values of l/w. When l/w [ (l/w) 0 , the demagnetizing factor N keeps a small value and decreases slowly as l/w increases [18]. Due to a small value of N and the greatly decreased complex closure domain structures due to a large ratio l/w, the influence of H dem will be no more a major contributor to magnetization at this condition, and then the sample exhibits a much better soft magnetic characteristic.…”

Section: Resultsmentioning

confidence: 99%

“…When l/w is lower than the critical aspect ratio (l/w) 0 , here (l/w) 0 = 5.4, demagnetizing factor N decreases rapidly as l/w increases, and hence an increased H eff is applied to the samples [14,18]. As expected, increasing the aspect ratio of the ribbon may result in larger initial susceptibility as a result of decreasing axial demagnetizing factor N. The drastic reduction of susceptibility and the increase of coercivity as l/w decreases (Fig.…”

Section: Resultsmentioning

confidence: 99%

Influence of Aspect Ratio on Giant Magnetoimpedance Effect for Fe67Co18Si11B4 Amorphous Ribbons

Ding

Ke-min

Wang

et al. 2017

Acta Metall. Sin. (Engl. Lett.)

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The effect of sample geometry aspect ratio (l/w) on the giant magnetoimpedance (GMI) in Fe 67 Co 18 Si 11 B 4 amorphous ribbons was investigated systematically. The GMI profiles were measured as a function of the external magnetic field at different frequencies up to 110 MHz. The results show that there exists a critical aspect ratio ((l/w) 0 = 5.4) below which the maximum GMI effect and sensitivity g decrease with decreasing l/w and above which the maximum GMI effect keeps almost constant and g decreases with increasing l/w. The observed dependence on aspect ratio as (l/w) \ (l/w) 0 is correlated with the magnetization process: Complex domain structures emerged near the ribbon ends to decrease the magnetostatic energy, modify the transverse permeability and consequently GMI response. Contributions from transverse permeability and resistance may dominantly determine the change of GMI effect as (l/w) [ (l/w) 0 .

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“…Despite the relatively large remanence value, the NPs in NHS-1 are still too soft to be used as building blocks for PM. In fact, the BH max , evaluated after rescaling the magnetization for the volume estimated from the phase densities obtained from XPS and using the demagnetization factor (N ∥ = 0.1) 38 to take into account the internal field of the pellet, was 8 kJ m −3 . Although the proposed synthesis method proved to be an efficient route to obtain a metal/ferrite exchange coupled nanostructure, designing a system with enhanced BH max , exploitable for practical applications, requires the increase of the magnetic anisotropy of the spinel ferrite component.…”

Section: Resultsmentioning

confidence: 99%