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, homes, and function discusses contemporary advancements of magnetic fabrics, together with fabrication, characterization and functions within the aerospace, biomedical, and semiconductors industries. With contributions via overseas execs who own large and sundry services, this quantity encompasses either bulk fabrics and skinny motion pictures and coatings for magnetic purposes. A well timed reference e-book that describes things like ferromagnetism, nanomaterials, and Fe, ZnO, and Co-based fabrics, Advances in Magnetic fabrics is a fantastic textual content for college kids, researchers, and execs operating in fabrics technology.

  • Describes fresh advancements of magnetic fabrics, together with fabrication, characterization, and applications
  • Addresses quite a few commercial functions, reminiscent of 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 extensive and sundry expertise
  • Covers a holistic variety of magnetic fabrics in a variety of elements of procedure, homes, and function

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

Example text

With the − sign). , with the + sign). Thus, now the spins would be parallel (ferromagnetism in a solid, paramagnetism in two-atomic gases). The last-mentioned tendency dominates in the metals (iron, cobalt, and nickel) and in some rare earth elements, which are ferromagnetic. , manganese). Diatomic gases are also almost exclusively diamagnetic, and not paramagnetic. However, the oxygen molecule, because of the involvement of π-orbitals, is an exception important for the life sciences. The Heitler–London considerations can be generalized to the Heisenberg model of magnetism (Heisenberg 1928).

But, since the bulk Curie temperature is 1043 K, one realizes clearly that this trend must reverse at higher sizes to reach the bulk. It is also interesting to note that for Fe120–140 the moment decreases more rapidly within 600–700 K. The specific heat measurement for both Fe120–140 and Fe250–290 also show a peak at 650 K. This might be because iron clusters undergo a structural phase transition in this temperature range similar to the bulk iron which undergoes BCC–FCC–BCC phase transition, but only beyond the Curie temperature [131,132].

2 Coherent Rotation Let us consider a spherical particle of radius R with saturated magnetization in the direction ↑, subject to a magnetic field applied in the direction ↓. Then on the macroscopic scale, magnetization reversal involves the nucleation of a wall on a defect, followed by propagation of this wall. After nucleation, the wall surface increases until it reaches the maximal value πR2. 39) By a similar argument to the one used in the previous section, this barrier can be compared with the energy barrier ESW = KV characterizing the process of coherent rotation.

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

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