Modelling domain wall motion in soft magnetic alloys

Bishop, J.E.L.

doi:10.1016/0304-8853(84)90193-8

Cited by 22 publications

(3 citation statements)

References 57 publications

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“…The Kerr results provide direct evidence of strong dw bowing and dw merging at the surface for sufficiently high (Jpf) product. Such conditions are largely met in the present experiments, thereby calling for an appropriate model for the dw motion, which we developed, starting from the classical Bishop's model [20,21], according to the following assumptions: respectively, at 5 kHz.…”

Section: A From Domain Wall Bowing To the Front-like Mechanismmentioning

confidence: 99%

“…We shall associate the evolution of the dynamic losses versus f and Jp with stroboscopic Kerr observations of the surface domain structure. The Kerr experiments will provide a stringent test for the modeling of the dw dynamics, which will be carried out starting from the concept of dw bowing and its numerical implementation, for an array of equally spaced dws, bearing on Bishop's analysis of flexible, eddy current limited motion of single 180° dws [20,21].…”

Section: Introductionmentioning

confidence: 99%

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Wideband magnetic losses and their interpretation in HGO steel sheets

Barrière

Ferrara

Magni

et al. 2023

Journal of Magnetism and Magnetic Materials

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Section: A From Domain Wall Bowing To the Front-like Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wideband magnetic losses and their interpretation in HGO steel sheets

Barrière

Ferrara

Magni

et al. 2023

Journal of Magnetism and Magnetic Materials

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“…6k = 2Jsx'dYk + 2Js c [(axk/da,)6yk -(ayk/dor/)axklil (5) / is the rate of flux reversal by the kth segment. The AJk (with j # k) are dimensionless eddy-current interaction coefficients obtained by lumping the flux being reversed by the kth segment at its mid-point and approximating the mean resulting field at thejth segment by the field at its mid-point [19]. This yields: ( 6 4 This approximation is inadequate for the self-drag coefficients Aii.…”

Section: Sheet Surface W E T Surfacementioning

confidence: 99%

Simulation of unstable domain wall motion in grain oriented Si-Fe

Bishop¹

1989

Phys. Scr.

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A chain of equal variable wall segments is used to model magnetic domain wall motion in alloys with positive cubic anisotropy. Irreversible kink distortions arise naturally when segments adopt unstable orientations. Agreement with experimental data is better than obtained with earlier models that model that can follow irreversible changes in wall orientation through the metastable and unstable zones.formed kinks at the onset of metastability.

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Domain Theory

Hubert

Schäfer

Magnetic Domains

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Domain observation and domain theory must go together in the study of magnetic microstructure. This chapter introduces domain theory. The focus is on applicationoriented procedures rather than on the well-established fundamentals. A more detailed analysis is offered where it illustrates characteristic mechanisms. In this case intermediate steps are presented as a guideline to encourage the reader to reproduce the line of arguments. In Sect. 3.2 the free energy of a magnet is presented. The principle that this energy must be a minimum leads to the micromagnetic equations and their dynamic generalizations. A discussion of the origin of domains from the viewpoint of theory (Sect. 3.3) is followed by two sections, which deal with cases for which no knowledge of domain walls is necessary. Phase theory (Sect. 3.4) is adequate for the calculation of the reversible magnetization curve of large, bulk crystals. Small particle switching theory (Sect. 3.5) applies to small particles that are too small to contain regular domain walls. For all intermediate cases domain walls become important. Their properties are summarized in Sect. 3.6, which also includes a discussion of substructures of domain walls and of wall dynamics. In the last part of the chapter (Sect. 3.7) a number of commonly occurring domain features-like domain branching or dense stripe domains-are discussed from a theoretical point of view. This section ends with a thorough discussion of a seemingly simple, but actually rather complex model case: the Néel block.Sketch 3.12.

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Modelling domain wall motion in soft magnetic alloys

Cited by 22 publications

References 57 publications

Wideband magnetic losses and their interpretation in HGO steel sheets

Wideband magnetic losses and their interpretation in HGO steel sheets

Simulation of unstable domain wall motion in grain oriented Si-Fe

Domain Theory

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