## Abstract

The propagation of acoustic waves in magnetic insulators is studied theoretically, first from a general point of view and then in the weak coupling limit. Both the modulation of the exchange integral and the single-ion magnetostriction are considered as coupling mechanisms between the spin and the phonon systems. At low temperatures, where the spin system can be described by non-interacting magnons, the attenuation coefficient is calculated for a planar ferromagnet. For the 1-D material CsNiF_{3} explicit expressions for the ultrasonic attenuation coefficient α_{ph} are computed in both zero and finite external field. α_{ph} is found to be linear in the temperature and quadratic in the phonon frequency for H=0. However, in a finite field the frequency dependence becomes linear and the temperature and field dependences are rather complicated.

Original language | English (US) |
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Pages (from-to) | 7415-7417 |

Number of pages | 3 |

Journal | Journal of Applied Physics |

Volume | 50 |

Issue number | B11 |

DOIs | |

State | Published - 1979 |

## ASJC Scopus subject areas

- Physics and Astronomy(all)