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- W2025852802 abstract "The quasi-static magnetization curve of the magnetic Ba-ferrite (BaFe12O19) glass ceramics is analyzed. This recently presented material is isotropic with a high coercivity Hc. From its structural peculiarities, the magnetic properties are explained as an assembly property of mutually separated, disk-shaped, uniaxial, single-domain particles. An extension of the classical Stoner–Wohlfarth theory is derived where a relatively weak dipolar interaction appears as an effective stochastic magnetic field which becomes, for large volume packing fractions η of the magnetic particles, strongly dependent on the particle orientation and details of the short-range order. Three parameters are sufficient to characterize the structural details of the assembly: η, the mean aspect ratio 〈d〉 of the particles, and a new one describing the short-range order. An analytic approximant of the theoretical magnetization curve for η=0.64 is outlined. Both the shape anisotropy of the particles and the fluctuating part of the effective stochastic magnetic field diminish the theoretical Hc compared with the Stoner–Wohlfarth value. The stable branch of the experimental magnetization curve (first quadrant) of a dense glass ceramic (η≈0.6) is well fitted by the theory thus allowing the determination of structural parameters. There remain significant deviations between the (fitted) theoretical and experimental magnetization curve near Hc. In particular, the experimental Hc is smaller than the predicted one. This is explained by an unsuitable particle size distribution with a significant contribution of large particles which turn into a multi-domain behavior approaching Hc." @default.
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- W2025852802 date "2001-10-01" @default.
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- W2025852802 title "Magnetic glass ceramics and Stoner–Wohlfarth systems with dipolar interaction" @default.
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