THE EFFECT OF TWO-MAGNON SCATTERING ON PARALLEL-PUMP INSTABILITY THRESHOLDS.
Abstract
Following a general description of the important properties and symmetries of the parallel-pump coupling and of two-magnon scattering, several theoretical approaches to the problem of the effect of two-magnon scattering on the parallel-pump instability threshold are explored. A successful approach, based on the rate of energy flow among the spinwave modes and involving only elementary mathematical tools, is developed. Extensive experimental data on the wave vector dependence of delta H sub k over a wide range of temperatures in ferromagnetic CdCr2Se4 are also presented. Results of theoretical calculations at several temperatures are compared with these data, and interesting information about spinwave renormalization and the dominant multimagnon scattering mechanisms at temperatures up to about 90% of the Curie temperature is obtained. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1969
- Accession Number
- AD0698123
Entities
People
- Jay Peter Sage
Organizations
- Harvard University