STUDY OF FERRIMAGNETIC CRYSTALS BY PARALLEL PUMPING.
Abstract
A study of single-crystal ferrimagnetic crystals at microwave frequencies was conducted. The parallelpumping technique was used to experimentally measure spin-wave linewidth, magnetoelastic coupling constants, energy exchange constants, and phonon linewidths. The experiments were carried out at 300K, 194K, 77K, and 4.2K at X- and K-band frequencies. Four samples of pure, single-crystal yttrium iron garnet (one disk, and three spheres) were extensively investigated. Conditions for optimum detection sensitivity of spin-wave instability measurement are given and discussed. The theory of parallel pumping is explained and worked out in detail. Expressions are obtained for spin-wave and phonon linewidths, magnetoelastic constants and exchange constants in terms of experimentally measured quantities. A literature search was made for publications dealing with parallel-pumping phenomena. These articles (over 75) are abstracted for their contents relative to this investigation. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1965
- Accession Number
- AD0613321
Entities
People
- Frank A. Olson
- James C. Sethares
Organizations
- Air Force Cambridge Research Laboratories