Physics of Magnetism

CHAPTER 16. MAGNETOSTRICTIVE MATERIALS 175

The second-order crystal-field term introduced by this symmetry leads to a ground state
with a 4f-electron distribution that is no longer cubic. If one assumes, for instance, a prolate
shape, the coupling to the strain mode gives rise to a lattice expansion along the [001] direc­
tion and a contraction along [100] and [010]. For a different sign of the magnetostriction
constant one would have observed a lattice contraction along [001] and an expansion
along [100] and [010].

References

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Chikazumi, S. (1966) Physics of magnetism, New York: John Wiley and Sons.

Clark, A. E. (1980) in E. P. Wohlfarth (Ed.) Ferromagnetic materials, Amsterdam: North Holland, Vol. 1, p. 531.

Cullen, R., Clark, A. E., and Hathaway, Kristl. B. (1994) in R. W. Cahn et al. (Eds) Material science and

technology, Weinheim: VCH Verlag, Vol. 3B, p. 529.

Gignoux, D. (1992) in R. W. Cahn et al. (Eds) Material science and technology, Weinheim: VCH Verlag, Vol. 3A,

p. 367.

Morin, F. and Schmitt, D. (1990) in K. H. J. Buschow (Ed.) Magnetic materials, Amsterdam: Elsevier Science

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Morrish, A. H. (1965) The physical principles of magnetism, New York: John Wiley and Sons.