This paper reports a study of the effect of the electron-phonon interaction on the magnetization below the Curie point of an itinerant-electron ferromagnet. From a numerical calculation on a simple model, it is found that the size of the effect can be much larger than the generally assumed value of $\sim \frac{\hslash {\omega }_{\mathrm{D}}}{{\epsilon }_{\mathrm{F}}}$ in the units of Bohr magneton per atom, where ${\omega }_{\mathrm{D}}$ and ${\epsilon }_{\mathrm{F}}$ are, respectively, the phonon Debye frequency and the electron Fermi energy.

• Received 21 August 1981

DOI:https://doi.org/10.1103/PhysRevLett.47.1213