### Abstract

Expressions for the magnetic susceptibility of a two-sublattice ferrimagnet are derived from semiclassical equations of motion. The dispersion equation of a bulk polariton is derived in general form, and the properties of bulk polaritons in ferrimagnets are discussed. The susceptibility is also used to calculate the magnetostatic correction to the frequency of long-wavelength magnons. The results are illustrated with numerical calculations for rare-earth iron garnets, and details of the mean field model and parameters used are given in an appendix.

Original language | English |
---|---|

Article number | 020 |

Pages (from-to) | 4021-4031 |

Number of pages | 11 |

Journal | Journal of Physics C: Solid State Physics |

Volume | 12 |

Issue number | 19 |

DOIs | |

Publication status | Published - 1979 |

Externally published | Yes |

### Fingerprint

### ASJC Scopus subject areas

- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics

### Cite this

*Journal of Physics C: Solid State Physics*,

*12*(19), 4021-4031. [020]. https://doi.org/10.1088/0022-3719/12/19/020

**Polaritons in ferrimagnets.** / Oliveira, F. A.; Khater, A. F.; Sarmento, E. F.; Tilley, D. R.

Research output: Contribution to journal › Article

*Journal of Physics C: Solid State Physics*, vol. 12, no. 19, 020, pp. 4021-4031. https://doi.org/10.1088/0022-3719/12/19/020

}

TY - JOUR

T1 - Polaritons in ferrimagnets

AU - Oliveira, F. A.

AU - Khater, A. F.

AU - Sarmento, E. F.

AU - Tilley, D. R.

PY - 1979

Y1 - 1979

N2 - Expressions for the magnetic susceptibility of a two-sublattice ferrimagnet are derived from semiclassical equations of motion. The dispersion equation of a bulk polariton is derived in general form, and the properties of bulk polaritons in ferrimagnets are discussed. The susceptibility is also used to calculate the magnetostatic correction to the frequency of long-wavelength magnons. The results are illustrated with numerical calculations for rare-earth iron garnets, and details of the mean field model and parameters used are given in an appendix.

AB - Expressions for the magnetic susceptibility of a two-sublattice ferrimagnet are derived from semiclassical equations of motion. The dispersion equation of a bulk polariton is derived in general form, and the properties of bulk polaritons in ferrimagnets are discussed. The susceptibility is also used to calculate the magnetostatic correction to the frequency of long-wavelength magnons. The results are illustrated with numerical calculations for rare-earth iron garnets, and details of the mean field model and parameters used are given in an appendix.

UR - http://www.scopus.com/inward/record.url?scp=0042212487&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0042212487&partnerID=8YFLogxK

U2 - 10.1088/0022-3719/12/19/020

DO - 10.1088/0022-3719/12/19/020

M3 - Article

AN - SCOPUS:0042212487

VL - 12

SP - 4021

EP - 4031

JO - Journal of Physics Condensed Matter

JF - Journal of Physics Condensed Matter

SN - 0953-8984

IS - 19

M1 - 020

ER -