Zhang, Sam; Zhao, Dongliang's Advances in magnetic materials : processing, properties, and PDF

By Zhang, Sam; Zhao, Dongliang

ISBN-10: 1498706711

ISBN-13: 9781498706711

Advances in Magnetic fabrics: Processing, houses, and function discusses fresh advancements of magnetic fabrics, together with fabrication, characterization and purposes within the aerospace, biomedical, and semiconductors industries. With contributions through overseas pros who own wide and sundry services, this quantity encompasses either bulk fabrics and skinny movies and coatings for magnetic purposes. A well timed reference publication that describes things like ferromagnetism, nanomaterials, and Fe, ZnO, and Co-based fabrics, Advances in Magnetic fabrics is an excellent textual content for college kids, researchers, and pros operating in fabrics technological know-how.

  • Describes contemporary advancements of magnetic fabrics, together with fabrication, characterization, and applications
  • Addresses numerous business purposes, corresponding to aerospace, biomedical, and semiconductors
  • Discusses bulk fabrics and skinny motion pictures and coatings
  • Covers ferromagnetism, nanomaterials, Fe, ZnO, and Co-based materials
  • Contains the contributions of foreign pros with vast and sundry expertise
  • Covers a holistic diversity of magnetic fabrics in numerous features of method, homes, and function

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Additional info for Advances in magnetic materials : processing, properties, and performance

Sample text

If the particles are magnetically anisotropic, the calculation of the equilibrium magnetization becomes more complicated. According to the nature of factors giving rise to the nonequivalence of the directions of magnetic moments, one can distinguish the magnetically crystalline anisotropy: shape anisotropy, anisotropy associated with the internal stress and external impact, exchange anisotropy and so on [109]. For nanoparticles, the surface magnetic anisotropy plays a special role. Unlike other kinds of magnetic anisotropy, the surface anisotropy is proportional to the surface area of the particle S rather than to its volume V.

Just like nonmagnetic oxide nanoparticles, the surface of ferrite nanoparticles is often modified by surfactants, silicones, or phosphoric acid derivatives to increase their stability in solution [52]. Cubic cobalt oxide (CoO) is antiferromagnetic with TN = 291 K that has played an important role in the discovery of “exchange shift” of the hysteresis curve [53,54]. This was first found for samples with oxidized Co nanoparticles [55]. The dependency of Neel temperature (TN) on the particle size was obtained during a study of CoO nanoparticles dispersed in LiF matrix [56].

It was assumed that the magnetic dipole–dipole interactions, which predominate in the systems under consideration, act as a random factor and prevent magnetization (ordering) of the system. It is worth noting that, although the proposed approach is strictly applicable only to equilibrium systems, it describes satisfactorily the magnetization curves at any temperatures, including those below the blocking temperature Tb. The applicability of this model for T < Tb is apparently due to the predominance of interparticle interactions over one-particle effects for all the samples studied.

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Advances in magnetic materials : processing, properties, and performance by Zhang, Sam; Zhao, Dongliang

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