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 foreign execs who own huge and sundry services, this quantity encompasses either bulk fabrics and skinny movies and coatings for magnetic functions. A well timed reference ebook that describes things like ferromagnetism, nanomaterials, and Fe, ZnO, and Co-based fabrics, Advances in Magnetic fabrics is an excellent textual content for college students, researchers, and execs operating in fabrics technology.

  • Describes fresh advancements of magnetic fabrics, together with fabrication, characterization, and applications
  • Addresses a number of business purposes, corresponding to aerospace, biomedical, and semiconductors
  • Discusses bulk fabrics and skinny movies and coatings
  • Covers ferromagnetism, nanomaterials, Fe, ZnO, and Co-based materials
  • Contains the contributions of overseas execs with vast and sundry expertise
  • Covers a holistic diversity of magnetic fabrics in a number of elements of method, houses, and function

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

Sample text

This is because the thermal tendency to disorder overwhelms the energy-lowering due to ferromagnetic order. 14 Schematic representation of ferromagnetism: (a) in presence of magnetic field and (b) in absence of magnetic field. (Drawn based on S. V. Vonsovskii, R. Hardin, Magnetism, John Wiley & Sons, 1974, Vol. ) Ferromagnetism only occurs in a few substances: iron, nickel, cobalt, their alloys, and some alloys of rare earth metals. Iron comes with two forms of magnetism: hard and soft. In hard iron, the domains will not shift back to their starting points when the field is taken away and is used in permanent magnets.

To find the corresponding critical volume, Kittel [127] considered a spherical particle of radius R, characterized by a uniaxial anisotropy constant K. 34) When this same particle is divided into two equal domains, Kittel assumes that the energy of the demagnetizing field is divided by two. 35) where the term in R2 represents the wall energy. 36) Magnetic Behavior of Nanostructured Materials 41 In metallic iron, the critical radius Rc obtained in this way is of the order of 7 nm. Below this size, the nanoparticles are spontaneously magnetized.

Recently, research has explored the synthesis and exchange bias effect in these Co–CoO core-shell nanoparticles with a gold outer shell [74]. In general, nanoparticles with a magnetic core consisting either of elementary iron or cobalt with a nonreactive shell made of graphene offers enhanced magnetic properties compared to ferrite or elemental nanoparticles in terms of: • Higher magnetization • Higher stability in acidic and basic solution as well as organic solvents • Chemistry on the graphene surface via methods already known for carbon nanotubes [75–77] In addition, core-shell nanoparticles may also form external functional groups.

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

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