Ferromagnetism, Antiferromagnetism, and Ferrimagnetism

  • Adrianus J. Dekker
Chapter

Abstract

In ferromagnetic materials the magnetization versus magnetic field relationship exhibits hysteresis similar to that encountered in Chapter 8 for the relationship between P and E in ferroelectric materials. Of the elements, only Fe, Ni, Co, Gd, and Dy are ferromagnetic, although there are a relatively large number of ferromagnetic alloys and oxides (see Table 19-2). Above a critical temperature θ, known as the ferromagnetic Curie temperature the spontaneous magnetization vanishes and the material becomes paramagnetic. Well above the Curie temperature the susceptibility follows the Curie-Weiss law
(19-1)
where θ is the Curie constant; the temperature 6 is called the paramagnetic Curie temperature and is usually some degrees higher than θf(see Fig. 19-4).

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References

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Copyright information

© Macmillan Publishers Limited 1981

Authors and Affiliations

  • Adrianus J. Dekker
    • 1
  1. 1.Department of Electrical EngineeringUniversity of GroningenNetherlands

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