The Harrison Model as a Tool to Study Phase Transitions in Magnetocaloric Materials

Gębara, P.; Gozdur, R.; Chwastek, Krzysztof

doi:10.12693/aphyspola.134.1217

Cited by 6 publications

(6 citation statements)

References 30 publications

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“…The present contribution is inspired by an excellent review work published recently [5]. It extends several concepts which have been mentioned in the previous publications [6][7][8][9]. The fundamental concept of the paper is to modify the Harrison model of ferromagnetism to make it more useful for engineering purposes.…”

Section: Introductionmentioning

confidence: 88%

“…the new vector quantity βm B can be called a "supermagneton". In this model the "supermagneton" is a new quantum particle, that is acted upon by the effective field" [6].…”

Section: A Brief Introduction To the Harrison Modelmentioning

confidence: 99%

“…In other words, the original approach corresponds to the multiplication effect for a single hysteresis operator; thus, it means that the model is subject to averaging and homogenization, not just because of the presence of the averaged quantity α, but also because all operators are treated as the same. According to the model developer, the Weiss coefficient accounts for the exchange field between atomic moments, while the domain coefficient, i.e., β, describes the atomic moment summation process [6].…”

Section: A Brief Introduction To the Harrison Modelmentioning

confidence: 99%

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An Alternative Formulation of the Harrison Model

Chwastek,

Gębara,

Przybył

et al. 2023

Applied Sciences

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The approach advanced by Harrison puts in the spotlight the fundamental role of bistability in hysteresis modeling. The description is based on physical premises concerning irreversible thermodynamics. In the original model, the upscaling of irreversible phenomena acting on the micromagnetic level is carried out by the introduction of a phenomenological parameter β. In the present paper, an alternative approach is proposed. The outputs of individual outputs of elementary hysteresis units (hysterons) are considered like in the stop model. A verification of the proposed model is carried out using measurement data for a praseodymium–dysprosium ribbon sample and a cylinder core made of cobalt-based amorphous material.

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Section: Introductionmentioning

confidence: 88%

“…the new vector quantity βm B can be called a "supermagneton". In this model the "supermagneton" is a new quantum particle, that is acted upon by the effective field" [6].…”

Section: A Brief Introduction To the Harrison Modelmentioning

confidence: 99%

Section: A Brief Introduction To the Harrison Modelmentioning

confidence: 99%

See 1 more Smart Citation

An Alternative Formulation of the Harrison Model

Chwastek,

Gębara,

Przybył

et al. 2023

Applied Sciences

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“…Multiplication by m and regrouping leads to the relationship g = t m 4 3 + (t − 1)m 2 − hm, which for a constant t value (t ∈ 0; 1 ) behaves qualitatively quite similarly to expression (1). The connection of the Harrison concept to the fundamental Landau theory was first elucidated in [25].…”

Section: The Harrison Model Versus Other Commonly Used Descriptions O...mentioning

confidence: 99%

Modeling the Effect of Compressive Stress on Hysteresis Loop of Grain-Oriented Electrical Steel

2022

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Modeling of hysteresis loops may be useful for the designers of magnetic circuits in electric machines. The present paper focuses on the possibility to apply the Harrison model to describe hysteresis loops of grain-oriented electrical steel subject to compressive stress. The model extension is achieved by introduction of an additional term into the equation that describes irreversible magnetization process. The extension term does not include a product of stress and magnetization, as could be anticipated from Sablik’s theory, applicable, e.g., to the Jiles–Atherton model. The present contribution points out the fundamental differences between the two aforementioned modeling approaches, which are based on different philosophies despite some apparent similarities. The modeling results are in a qualitative agreement with the experimental results obtained from a single sheet tester for a representative commercially available grain-oriented electrical steel grade 0.27 mm thick.

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“…Wall jumps create a change in magnetic flux and thus generate eddy currents that dissipate energy due to the Joule effect. Since temperature is a factor strongly affecting ferromagnetic material properties (study [1] showed the temperature effect on magnetization curves for special materials), describing the losses accurately is crucial [2,3].…”

Section: Introductionmentioning

confidence: 99%

Estimation of Jiles-Atherton Parameters of Toroid Cores Using MATLAB/Simulink

2023

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This paper addresses the development and testing of a new genetic-like algorithm for the Jiles-Atherton ferromagnetic hysteresis model parameter fitting. The MATLAB/Simulink environment was used for the simulation and postprocessing of data. Firstly, the model's first-order ordinary differential equation is introduced with a brief description of its parameters. A correction parameter was introduced into the equation to eliminate the non-physical behavior of the model. Then the fitting algorithm and fit function are described. An experimental setup is built to measure the hysteretic loops of a ferromagnetic toroid core consisting of an iron powder material. The major and several minor hysteresis loops were measured and used as inputs into the model fitting algorithm. The measurement is then compared with the simulated results.

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The Harrison Model as a Tool to Study Phase Transitions in Magnetocaloric Materials

Cited by 6 publications

References 30 publications

An Alternative Formulation of the Harrison Model

An Alternative Formulation of the Harrison Model

Modeling the Effect of Compressive Stress on Hysteresis Loop of Grain-Oriented Electrical Steel

Estimation of Jiles-Atherton Parameters of Toroid Cores Using MATLAB/Simulink

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