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Amorphous and nano-crystalline soft magnetic materials

Amorphous and nano-crystalline soft magnetic materials

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This chapter discusses the advent of nano-crystalline and amorphous soft magnetic materials and their properties and production methods. The magnetic material is produced commercially in the form of ribbon much thinner than any electrical steel, so eddy currents are naturally low under a.c. excitation. This, combined with inherent large resistivity, leads to low losses. No grain boundaries are present to impede domain wall motion, so hysteresis losses are low and very high permeability can be achieved. It was soon recognised that amorphous ribbon was indeed an exciting new class of engineering material which not only could replace conventional soft magnetic materials in many applications but could also satisfy magnetic requirements in entirely new applications.

Chapter Contents:

  • 15.1 Amorphous materials
  • 15.1.1 Production of amorphous magnetic materials
  • 15.1.2 Composition
  • 15.1.3 Magnetic structure
  • 15.1.4 Coatings and surface treatment
  • 15.1.5 Stress sensitivity
  • 15.1.6 Magnetostriction
  • 15.1.7 Consolidated Fe-based amorphous material (POWERCORE)
  • 15.1.8 Bulk amorphous material
  • 15.2 Nano-crystalline magnetic materials
  • 15.2.1 Production of nano-magnetic material
  • 15.2.2 Magnetic properties
  • 15.2.3 Coating and surface treatment
  • 15.2.4 Stress sensitivity
  • 15.3 General properties of amorphous and nano-materials
  • 15.3.1 Families of amorphous materials
  • 15.3.2 Commercial materials
  • 15.4 High silicon micro-crystalline ribbon
  • 15.5 Applications of amorphous and nano-crystalline ribbons
  • References

Inspec keywords: soft magnetic materials; materials preparation; magnetostriction; nanomagnetics; magnetisation; nanostructured materials; amorphous magnetic materials; magnetic domains

Other keywords: rapid solidification technology; magnetostriction; magnetic structure; magnetisation; nanocrystalline soft magnetic materials; amorphous soft magnetic materials

Subjects: Magnetic domain walls and domain structure; Magnetomechanical and magnetoelectric effects, magnetostriction; Magnetization curves, hysteresis, Barkhausen and related effects; Magnetic properties of nanostructures; Amorphous and nanostructured magnetic materials; Preparation of metals and alloys (compacts, pseudoalloys)

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