Abstract
The magnetostriction of ferromagnets which crystallize in the hcp structure is discussed phenomenologically. It is shown that, in addition to the coupling of the magnetization to uniform deformations, there is a linear coupling to an internal distortion, i.e., one which does not alter the shape of the unit cell. This distortion transforms in the same manner as the orthorhombic (\ensuremath{\gamma}) strain under the operations of the space group of the hcp lattice; hence the two are also coupled linearly. Taking these couplings into account, the pair model of magnetostriction is extended and applied to an analysis of the magnetostriction of hcp Co and Co-Fe alloys. It is shown that, when the effect of the internal distortion is included, a reasonable account can be given for the strengths and signs of all the modes of magnetostriction in this series.
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