The Experts below are selected from a list of 219 Experts worldwide ranked by ideXlab platform
Bernard Dieny - One of the best experts on this subject based on the ideXlab platform.
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Magnetostatics of synthetic ferrimagnet elements
Journal of Magnetism and Magnetic Materials, 2012Co-Authors: Olivier Fruchart, Bernard DienyAbstract:We calculate the Magnetostatic Energy of synthetic ferrimagnet (SyF) elements, consisting of two thin ferromagnetic layers coupled antiferromagnetically through RKKY coupling. We calculate exact formulas as well as approximate yet accurate ones, which can be used to easily derive Energy barriers and anisotropy fields of SyF. These can be used to evaluate coercivity, thermal stability and other useful quantities.
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Magnetostatics of synthetic ferrimagnet elements
Journal of Magnetism and Magnetic Materials, 2012Co-Authors: Olivier Fruchart, Bernard DienyAbstract:International audienceWe calculate the Magnetostatic Energy of synthetic ferrimagnet (SyF) elements, consisting of two thin ferromagnetic layers coupled antiferromagnetically through RKKY coupling. We calculate exact formulas as well as approximate yet accurate ones, which can be used to easily derive Energy barriers and anisotropy fields of SyF. These can be used to evaluate coercivity, thermal stability and other useful quantities
Amikam Aharoni - One of the best experts on this subject based on the ideXlab platform.
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Periodic walls in very thin films
Journal of Physics: Condensed Matter, 1998Co-Authors: Amikam AharoniAbstract:Analytic formulae are given for the coefficients needed for computing the Magnetostatic Energy of a domain wall with a periodic magnetization structure, for the case of a film sufficiently thin that there is no dependence on the coordinate along the film thickness. A method is given for reducing the computational time of the Magnetostatic Energy, which can also be used in other wall computations carried out by the LaBonte method. Several typographical errors in the published coefficients for a magnetization structure with cylindrical symmetry in a sphere are corrected.
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Comment on ‘‘Krammer’s rate theory, broken symmetries, and magnetization reversal’’ [J. Appl. Phys. 76, 6310 (1994)]
Journal of Applied Physics, 1996Co-Authors: Amikam AharoniAbstract:In a series of papers, H. B. Braun [J. Appl. Phys. 76, 6310 (1994), and references therein] suggested a model for magnetization reversal in an infinite cylinder, but did not include the Magnetostatic Energy. It is shown here that the Magnetostatic Energy term of this one‐dimensional soliton solution cannot be neglected, and cannot be normalized out. This argument invalidates all the theoretical conclusions from this model about superparamagnetism in an infinite circular cylinder, and about the reversal modes of elongated particles.
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Magnetostatic Energy of the soliton in a cylinder
Journal of Magnetism and Magnetic Materials, 1995Co-Authors: Amikam AharoniAbstract:Abstract The Magnetostatic Energy is calculated for the one-dimensional soliton solution used to study superparamagnetism in an infinite circular cylinder. It is found that this neglected Energy term is usually larger than the Energy terms which were taken into account.
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Magnetostatic Energy calculations
IEEE Transactions on Magnetics, 1991Co-Authors: Amikam AharoniAbstract:Magnetostatic self-Energy can in principle be calculated by evaluating a certain sixfold integral, though this is not practical even for very simple cases. It is pointed out that some analytic transformation of this integral can facilitate computations, especially with an appropriate choice of Ritz models. A review of these is followed by a review of some of the methods that have been used for numerical evaluation of this Energy term, in particular Brown's method of approaching the value by calculating rigorous upper and lower bounds. >
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Useful upper and lower bounds to the Magnetostatic self-Energy
IEEE Transactions on Magnetics, 1991Co-Authors: Amikam AharoniAbstract:The Magnetostatic Energy of a spherical particle is shown to be bounded between two specific expressions which contain local variables only. Evaluating such expressions in numerical computations of magnetization configurations should be much simpler than the evaluation of the actual Magnetostatic Energy. An approximation in which the error can be controlled, and is known at each step of the minimization procedure is suggested. It is based on general inequalities which place the rigorous value of the Magnetostatic Energy between upper and lower bounds. Using these upper and lower bounds is therefore expected to reduce the total computation time by orders of magnitude. >
Olivier Fruchart - One of the best experts on this subject based on the ideXlab platform.
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Magnetostatics of synthetic ferrimagnet elements
Journal of Magnetism and Magnetic Materials, 2012Co-Authors: Olivier Fruchart, Bernard DienyAbstract:We calculate the Magnetostatic Energy of synthetic ferrimagnet (SyF) elements, consisting of two thin ferromagnetic layers coupled antiferromagnetically through RKKY coupling. We calculate exact formulas as well as approximate yet accurate ones, which can be used to easily derive Energy barriers and anisotropy fields of SyF. These can be used to evaluate coercivity, thermal stability and other useful quantities.
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Magnetostatics of synthetic ferrimagnet elements
Journal of Magnetism and Magnetic Materials, 2012Co-Authors: Olivier Fruchart, Bernard DienyAbstract:International audienceWe calculate the Magnetostatic Energy of synthetic ferrimagnet (SyF) elements, consisting of two thin ferromagnetic layers coupled antiferromagnetically through RKKY coupling. We calculate exact formulas as well as approximate yet accurate ones, which can be used to easily derive Energy barriers and anisotropy fields of SyF. These can be used to evaluate coercivity, thermal stability and other useful quantities
Y. Midou - One of the best experts on this subject based on the ideXlab platform.
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Numerical simulation of domain structure in magnetic thin sheet
IEEE Transactions on Magnetics, 1996Co-Authors: Masato Enokizono, T. Todaka, Y. MidouAbstract:This paper describes a numerical analysis method of domain structure in a magnetic thin sheet. A stable domain structure of the thin sheet in an external magnetic field is analyzed by the iterative method that minimizes its total domain Energy. In this analysis, we assumed that the total domain Energy is sum of the Magnetostatic Energy, the anisotropy Energy, the domain wall Energy, and the elastic Energy. In particular, we applied the Biot-Savart formula and the Gauss quadrature formula on a surface integral to the calculation of the Magnetostatic Energy. The advantage of this method is that the calculation points in each domain are considerably reduced in comparison with the conventional method. The method is expanded to analyze the problems in any external field. Moreover, the initial domain structure is determined by the minimization of the total Energy.
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Moving simulation of magnetic domain structure in grain-oriented silicon steel sheet
Journal of Magnetism and Magnetic Materials, 1994Co-Authors: Masato Enokizono, Y. MidouAbstract:Abstract This paper describes a numerical analysis method of domain structure in a grain-oriented silicon steel sheet. The stable domain structure of silicon steel sheet in an external magnetic field is analyzed by an iterative method that minimizes its total domain Energy. In this analysis, we have assumed that the total domain Energy is sum of the Magnetostatic Energy, the anisotropy Energy, the domain wall Energy and the Zeeman Energy. In particular, we applied the Biot-Savart formula and Gaussian quadrature formula on the surface integral for the calculation of the Magnetostatic Energy.
Evgeny Y. Tsymbal - One of the best experts on this subject based on the ideXlab platform.
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Theory of Magnetostatic coupling in thin-film rectangular magnetic elements
Applied Physics Letters, 2000Co-Authors: Evgeny Y. TsymbalAbstract:A theory of Magnetostatic coupling in thin-film uniformly magnetized arrays of rectangular magnetic elements is presented. Analytic expressions for the Magnetostatic Energy and the dipolar fields are derived. The influence of the aspect ratio and the spacing between the elements on the Magnetostatic coupling is investigated. It is found that increasing the aspect ratio reduces the critical distance between the elements, above which the Magnetostatic inter-element coupling can be neglected.
