Apparatus for measurement of velocity of domain boundaries in two dimensions in grain-oriented silicon iron

Ledingham, S; Broadbent, Kent D.; Radley, Gordon

doi:10.1088/0031-8949/40/4/018

Cited by 6 publications

(2 citation statements)

References 3 publications

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“…Models were developed for the interior domain structures as to be expected from the observable surface patterns. In particular, a Kerr effect study on polycrystalline material [4] performed with B RD = 0.9 T yielded the very significant result that individual grains may show very different behaviours, a finding which was confirmed by [1]. Stroboscopic investigations of large, coated samples were performed by means of scanning electron microscope (SEM) [5].…”

Section: Introductionmentioning

confidence: 85%

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Domain reconstructions of g.o. SiFe during rotational magnetization considering also 3-D flux components

Galabov

Pfützner

Shilyashki

et al. 2014

JAE

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Domain analyses of modern types of grain-oriented (GO) transformer steel are rare, and they are focussed on single grains under academic magnetization patterns. The present Kerr effect study reveals that grains of industrial, polycrystalline materials react in specific ways according to individual crystallographic orientations. The amount of parameters is very large, especially if additional flux components are given as a further impact. The paper reports a procedure for statistical evaluations of quasi-dynamic Kerr effect images. The instantaneous area ratios of bar domain portion BD, oblique domain portion OD and saturation S are determined with consideration of peak induction BRD in the rolling direction (RD), axis ratio a of rotational magnetization, the angle ψ between B and RD, additional flux Bx in RD or Bz in normal direction. Focus is put on OD(t) which is assumed to be a key function for λ(t), i.e. the course of time of magnetostriction. As the most distinct tendencies, OD increases strongly with increases of a and ψ. OD(t) shows non-sinusoidal course of time with differences of the two halves of cycle. Rotation out of the RD yields sharp onsets of ODs, especially after half-cycle saturation. Additional off-plane flux enhances ODs in a general way.

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Section: Introductionmentioning

confidence: 85%

“…3(c)) which earlier has been entitled as zig-zag pattern (e.g. [4]). Further increase of ψ tends to yield an increasing portion of ODs.…”

Section: Domain Images For Mere Rotational Magnetizationmentioning

confidence: 99%

Domain reconstructions of g.o. SiFe during rotational magnetization considering also 3-D flux components

Galabov

Pfützner

Shilyashki

et al. 2014

JAE

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Advanced Soft Magnetic Materials for Power Applications

Moses

2007

Handbook of Magnetism and Advanced Magnetic Materials

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This article begins by introducing the importance of electrical steels in their application as electrical machine cores. Nonoriented, grain‐oriented, and high‐silicon steels comprise over 97% of the world's production of soft magnetic materials. The origin, controlling factors, and methods of optimizing their most important magnetic parameter, the core loss, are discussed. The effect of magnetizing frequency, flux density, mechanical stress, temperature, and flux distortion is shown. Magnetostriction is a further factor of importance in many devices, so this is briefly discussed. There is a growing interest in predicting the losses of electrical steels, so the need for better understanding of magnetization processes to build accurate models which will cater to the more stringent specifications of modern industry are discussed, and new approaches are reviewed. Powder composite materials are finding niche applications in power devices, so their magnetic properties are compared with those of the traditional lamination steels. The paper does not cover magnetically soft ferrites or iron–cobalt alloys which are used in specialized power magnetic applications.

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Investigations of Bloch wall mobility in crystalline and amorphous soft magnetic material

Schönhuber

Pfützner

Simpson

et al. 1992

Journal of Magnetism and Magnetic Materials

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Apparatus for measurement of velocity of domain boundaries in two dimensions in grain-oriented silicon iron

Cited by 6 publications

References 3 publications

Domain reconstructions of g.o. SiFe during rotational magnetization considering also 3-D flux components

Domain reconstructions of g.o. SiFe during rotational magnetization considering also 3-D flux components

Advanced Soft Magnetic Materials for Power Applications

Investigations of Bloch wall mobility in crystalline and amorphous soft magnetic material

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