Enhancement of the remanence and coercivity in Co-Cr layers
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Hysteresis
Stoner–Wohlfarth model
Single domain
Stoner–Wohlfarth model
Hysteresis
Saturation (graph theory)
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Hysteresis
Stoner–Wohlfarth model
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2-Dimensional and 3-Dimensional Remanence Enhancement of Isotropic Nanocrystalline Permanent Magnets
A transition region of domain-wall like structure forms in the crystalline grain boundary due to the exchange interaction between neighboring grains.The simplest magnetic domain like structure——linear distribution of magnetic moment,can put forward the analytical formulas to calculate tihe width and remanence of the transition region in ~1D(one-dimensional),~2D and ~3D spaces,which can explain remanence enhancement effects observed in such materials.The results are in good agreement with the experimental data.
Stoner–Wohlfarth model
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Nanocrystalline material
Micromagnetics
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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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We report on a study of the magnetic properties of Co/Pt multilayer films. We have examined nucleation and domain wall pinning controlled materials and observe two distinct forms of behaviour in terms of the samples hysteresis loops. We interpret our data in terms of a two coercivity model and we report on the magnetic behaviour in terms of a detailed analysis of irreversible magnetisation changes obtained from the measurement of remanence curves. The domain structures in remanent states have been examined using an MFM and we find a correlation between domain size and shape and the form of the associated remanence curves.
Stoner–Wohlfarth model
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Domain wall (magnetism)
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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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A new technique for the estimation of interparticle interaction effects in some magnetic systems is developed only on the basis of Fourier description of experimental hysteresis loops and initial magnetization curves, avoiding remanence measurements. This technique is applied for Ba-ferrite powders and for several currently used magnetic recording media. It is found that the results coincide fairly well with these obtained by the commonly accepted /spl Delta/I technique, using remanence curves.< >
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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.
Superparamagnetism
Particle (ecology)
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The magnetization processes of small (350 Å) and nearly spherical particles of -Fe2O3 were studied at room temperature using the initial, hysteresis and remanence magnetization curves. The effective interparticle interactions were estimated for a number of virgin and alternating current demagnetized samples of -Fe2O3-SiO2 mixtures with different magnetic phase concentrations. A non-monotonous dependence of the interactions on the magnetic phase concentration was observed. It was related to the changes in the domain state of some of the particles from the single-domain to the multi-domain.
Single domain
Stoner–Wohlfarth model
Hysteresis
Domain wall (magnetism)
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