Modeling hysteresis curves of anisotropic SmCoFeCuZr magnets

Silva, Fernanda A. Sampaio da; Castro, N. F.; Campos, Marcos Flávio de

doi:10.1016/j.jmmm.2012.09.048

Cited by 25 publications

(33 citation statements)

References 45 publications

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“…7. As the predicted recoil curves are near the experimentally observed for 2:17 type SmCo magnets [9], this implies that the coercivity mechanism is coherent rotation for these magnets, as already noted before [2,3].…”

Section: Model For Recoil Curves Of Hysteresissupporting

confidence: 84%

“…In the high coercivity SmCo 2:17 magnets, there is formation of a copper-rich paramagnetic Sm(Cu,Co) 5 cell phase surrounding the Sm 2 (CoFe) 17 nanocrystalline grains [3]. The copper-rich cell avoids interaction between the particles, and a behavior near that predicted by the SW model can be observed [2,3]. The low susceptibility (or low permeability) of the initial magnetization curve in thermally demagnetized samples, as shown in Figs.…”

Section: Model For Recoil Curves Of Hysteresismentioning

confidence: 87%

“…A very important assumption is monodomain particles. High coercivity Sm 2 Co 17 type magnets (5 element alloy Sm-Co-Cu-Fe-Zr) have shown behavior close to the SW prediction [2,3]. Here, it is briefly discussed how to predict recoil curves for anisotropic Stoner-Wohlfarth magnets [4,5].…”

Section: Introductionmentioning

confidence: 95%

“…In hard magnetic materials manufactured by powder metallurgy, as SmCo 5 [6,7], NdFeB [8], or SmCoFeCuZr [2], the particles are milled until they are a single crystal. Then there is a step of alignment of crystals under magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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Predicting Recoil Curves in Stoner-Wohlfarth Anisotropic Magnets

Campos

Castro

2019

Acta Phys. Pol. A

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It is possible to predict recoil curves in magnetic materials following the Stoner-Wohlfarth behavior. In the presented example, the shapes of recoil curves are predicted for anisotropic Stoner-Wohlfarth magnets, which follow distribution of type f = cos n (α), with n = 15. As the predicted recoil curves are near the experimentally observed ones for SmCoCuFeZr magnets, this implies that the coercivity mechanism is coherent rotation for these magnets.

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Section: Model For Recoil Curves Of Hysteresissupporting

confidence: 84%

Section: Model For Recoil Curves Of Hysteresismentioning

confidence: 87%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Predicting Recoil Curves in Stoner-Wohlfarth Anisotropic Magnets

Campos

Castro

2019

Acta Phys. Pol. A

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“…Such a Preisach model would then only consider alternation in a fix direction (as a scalar hysteresis model), which then is not considering the actual rotation in three dimensions. The simplest case of a single domain model is the Stoner–Wohlfarth model, which describes the magnetization of a material with a uniaxial structured anisotropy [ 24 ], which has been combined with Preisach models [ 25 , 26 , 27 , 28 ]. Such a model is only valid for one dimensional fields, since the model is limited to one dimension.…”

Section: Magnetic Hysteresismentioning

confidence: 99%

Review of Play and Preisach Models for Hysteresis in Magnetic Materials

Mörée

Leijon

2023

Materials

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This paper studies the properties of the Preisach model and the play model, and compare their similarities. Both are history-dependent hysteresis models that are used to model magnetic hysteresis. They are described as discrete sums of simple hysteresis operators but can easily be reformulated as integral equations of continuous distribution functions using either a Preisach weight distribution function or a play distribution function. The models are mostly seen as phenomenological or mathematical tools but can also be related to friction-like pinning of domain-wall motions, where Rayleigh’s law of magnetic hysteresis can be seen as the simplest case on either the play model or the Preisach model. They are poor at modeling other domain behavior, such as nucleation-driven hysteresis. Yet another hysteresis model is the stop model, which can be seen as the inverted version of the play model. This type of model has advantages for expressions linked to energy and can be related to Steinmetz equation of hysteresis losses. The models share several mathematical properties, such as the congruency property and wiping-out property, and both models have a history of dependence that can be described by the series of past reversal points. More generally, it is shown that the many models can be expressed as Preisach models, showing that they can be treated as subcategories of the Preisach type models. These include the play model, the stop model and also the alternative KP-hysteron model.

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