Modeling of hysteresis in magnetic cores with frequency-dependent losses
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Stoner–Wohlfarth model
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The observed asymmetry of the remanence loop of a particulate recording sample can be described by the complete-moving-hysteresis (CMH) model using a symmetrical Preisach distribution. The amount of asymmetry depends on the moving parameter, the squareness, and the reversible magnetization. It is shown that, for certain types of materials, the major hysteresis loop and the major remanence loop provide sufficient information to identify the moving parameter.< >
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Abstract To get information on the magnetization processes of permanent magnetic materials the angular dependences of the coercivity H c , the remanence coercivity H R , and the maximum position H of the total susceptibility are investigated. Considering two competing coercivity mechanisms and two different magnetic prehistories the differences between these three quantities are demonstrated by model calculations and experimental results on hard ferrites. It is shown that H R (θ) is the most suitable measure to describe the irreversible magnetization processes in polycrystalline hard magnets.
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Thermally activated magnetization reversal processes become manifest in the dependence of the remanent coercivity on the time during which a magnetic field is applied opposite to the initial magnetization direction. They have important consequences for the long term stability and short time writeability of future high density recording media. In this paper, we report on a new experiment using a contact write/read tester to study the time dependence of the remanent coercivity over more than 10 orders of magnitude (from 6 ns to >60 s). Remanence coercivity and signal decay measurements of a CoPtCr recording medium with 5.5 nm thickness are presented.
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The authors describe how the various model parameters needed to describe hysteresis on the basis of the Jiles-Atherton theory can be calculated from experimental measurements of the coercivity, remanence, saturation magnetization, initial anhysteretic susceptibility, initial normal susceptibility, and maximum differential susceptibility. The determination of hysteresis parameters based on this limited set of magnetic properties is of the most practical use since these are the properties of magnetic materials that are most likely to be available.< >
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Stoner–Wohlfarth model
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A method for estimation of reversible and irreversible susceptibilities of initial magnetization curves has been developed. It deals only with the energy necessary for magnetizing the sample and the nature of the magnetization processes is not important. Thus the method could be applied for a wide variety of real materials. A set of minor hysteresis loops of a virgin sample, plotted with progressively increasing maximum magnetic field, has been used. The obtained results for both reversible and irreversible magnetizations, showed excellent coincidence with those, calculated by the remanence curve method for a Stoner‐Wohlfarth model system.
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The aim of this study is to obtain high coercive HDDR powder using additions, without a significant degradation in remanence. In This study, Ga and Dy were chosen as additives. and their role in inducing coercivity will be discussed.
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Stoner–Wohlfarth model
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Hysteresis modelling of hard ferrites is discussed, as well as the coercivity mechanisms. The effect of the crystallographic texture on the hysteresis shape is discussed. The coercivity is strongly affect by the grain size. The Stoner-Wohlfarth model provides the upper limit for the coercive force. Limitations of the Stoner-Wohlfarth model are discussed.
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Measurements have been made of the hysteresis of thermally and field-demagnetized sintered specimens of a Nd-Fe-B permanent magnet. Sets of minor hysteresis loops have been obtained by a gradual increase in the maximum applied field thus enabling the intrinsic coercivity and the remanence coercivity to be plotted as a function of the maximum applied field. These results show that there is a threshold field which must be exceeded before a substantial coercivity can be obtained. Measurements of the magnetic viscosity have also been made which show that the change in the magnetization in a static reverse field varies with the logarithm of the time for which the field is applied. The slopes of the curves depended on the applied field; the maximum slope was observed when the applied field was equal to the coercivity.
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The coercive force and remanence of essentially spherical iron and iron-cobalt alloy particles with diameters from 20 to 3000 Å have been measured at 4°, 76°, and 207°K and compared to the theoretically predicted behavior. The remanence shows a broad, plateau-like maximum while the coercive force has a rather sharp maximum. The maximum of the coercive force occurs at a much larger particle diameter than the maximum of the remanence. It is shown that these essential characteristics follow from the theory. Deviations from theory are seen in the smaller size range and can be accounted for by the distribution of particle sizes. A general treatment of the coercive force of mixtures of thermally stable, high coercive force particles with superparamagnetic and multidomain particles is given.
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