Download e-book for kindle: Advances in magnetic materials : processing, properties, and by Zhang, Sam; Zhao, Dongliang

By Zhang, Sam; Zhao, Dongliang

ISBN-10: 1498706711

ISBN-13: 9781498706711

Advances in Magnetic fabrics: Processing, homes, and function discusses fresh advancements of magnetic fabrics, together with fabrication, characterization and functions within the aerospace, biomedical, and semiconductors industries. With contributions through overseas execs who own vast and sundry services, this quantity encompasses either bulk fabrics and skinny motion pictures and coatings for magnetic functions. A well timed reference booklet 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 numerous commercial purposes, comparable 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 pros with large and sundry expertise
  • Covers a holistic variety of magnetic fabrics in quite a few elements of technique, homes, and function

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

Sample text

When a material is placed in a magnetic field, the electrons circling the nucleus will experience a Coulomb attraction to the nucleus and Lorentz force from the magnetic field. Depending on which direction the electron is orbiting, this force may increase the centrifugal force on the electrons, pulling them in toward the nucleus, or it may decrease the force, pulling them away from the nucleus. This effect systematically increases the orbital magnetic moments that were aligned opposite the field, and decreases the ones aligned parallel to the field.

Wall displacement proceeds until a state is reached in which all moments are aligned with the field. This happens for Happ = NMs. 23. The way materials divide into domains is determined by competition between the wall energy and the energy of the demagnetizing field. The walls are quasi-2D objects and the wall energy is therefore a surface term. When the particle volume is reduced, this term becomes greater than the energy of the demagnetizing field. For very small dimensions, the most stable magnetization state is one in which there is just one domain.

The wall energy thus has values between one-tenth and 10 times the value for iron, with wall thicknesses between 300 nm in soft materials and 5 nm in hard materials. Note that the energy of a wall increases rapidly when its thickness cannot take the equilibrium value δ. The most important case is that of a confined wall. The increase in energy of the wall is due to the loss of exchange energy resulting from the fact that the magnetic moments must rotate rapidly from one atomic plane to the next in order to complete the 180° rotation over the available distance.

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

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