Results 161 to 170 of about 3,440 (189)
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Numerical micromagnetics: Rectangular parallelopipeds
International Conference on Magnetics, 1990Results of simulations of magnetization reversal in rectangular Permalloy particles with aspect ratios 10*5*1 are given. Magnetization patterns during nucleation of reversal in the remanent state and after the applied field is reversed are shown in detail for the case of an applied field along the long axis of the particle.
D.R. Fredkin, T.R. Koehler
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Micromagnetics of Cylindrical Particles
Physica Status Solidi (a), 1988A numerical method is given and discussed for some micromagnetic problems. The magnetic behaviour of geometric and magnetic rotationally symmetric particles is investigated here, especially the behaviour of finite cylinders. The numerical method bases on the minimization of the free energy. The minimum problem is transformed into a numerical convenient
J. Ehlert, F. K. Hübner, W. Sperber
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Catastrophe Model for Micromagnetics
Physical Review Letters, 1987It is shown that transition at the Curie point and uniaxial crystalline anisotropy exhibit catastrophes which have the same morphology as well-known elementary catastrophes like the cusp and the swallowtail. It is possible to understand micromagnetics as conflict between attractors of dynamical systems.
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Mathematical Models and Methods in Applied Sciences, 2005
We study a thin-shell limit of micromagnetic energy for soft small ferromagnets. The relations between thickness of the magnet t, diameter l and magnetic exchange length w are t/l → 0 and tl/w2 ≲ 1. We prove a Γ-convergence of the original 3D problem to a nonlocal 2D problem.
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We study a thin-shell limit of micromagnetic energy for soft small ferromagnets. The relations between thickness of the magnet t, diameter l and magnetic exchange length w are t/l → 0 and tl/w2 ≲ 1. We prove a Γ-convergence of the original 3D problem to a nonlocal 2D problem.
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2001
Abstract In this chapter and the next one, various topics in micromagnetics, outside the nucleation problem, will be described. The subdivision into analytic and numerical studies in the two chapters is rather artificial and quite arbitrary.
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Abstract In this chapter and the next one, various topics in micromagnetics, outside the nucleation problem, will be described. The subdivision into analytic and numerical studies in the two chapters is rather artificial and quite arbitrary.
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2001
Abstract In all the numerical computations in micromagnetics, nearly all the computer time is spent on computing the magnetostatic energy term for the different magnetization configurations which are being tried. It must be emphasized that this feature is independent of the computational method, and is a result of the inevitable fact ...
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Abstract In all the numerical computations in micromagnetics, nearly all the computer time is spent on computing the magnetostatic energy term for the different magnetization configurations which are being tried. It must be emphasized that this feature is independent of the computational method, and is a result of the inevitable fact ...
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2001
Abstract It can be concluded from the last chapter that there is no way to neglect any one of the three energy terms, exchange, anisotropy, and magnetostatic, and all three must be taken into account in any realistic theory of the magnetization processes.
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Abstract It can be concluded from the last chapter that there is no way to neglect any one of the three energy terms, exchange, anisotropy, and magnetostatic, and all three must be taken into account in any realistic theory of the magnetization processes.
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Micromagnetic perturbation theory
Journal of Magnetism and Magnetic Materials, 1977Abstract Analytical solutions of the micromagnetic variational problem are known only for simple geometries and material parameters. Such solutions can be used as the basis functions for a perturbation theory of more complicated systems. Examples are the evaluation of the effect of higher anisotropy terms on domain nucleation, magnetoelastic ...
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