PARAMETRIC-EXCITATION OF PHONONS BY MICROWAVE MAGNETIC-FIELD IN SINGLE-CRYSTAL SAMPLES OF HEMATITE

Authors
ANDRIENKO AV PODDYAKOV LV
Citation
Av. Andrienko et Lv. Poddyakov, PARAMETRIC-EXCITATION OF PHONONS BY MICROWAVE MAGNETIC-FIELD IN SINGLE-CRYSTAL SAMPLES OF HEMATITE, Journal of magnetism and magnetic materials, 123(1-2), 1993, pp. 120000027-120000029
Citations number
11
Categorie Soggetti
Material Science","Physics, Condensed Matter
Journal title
Journal of magnetism and magnetic materials → ACNP
ISSN journal
03048853
Volume
123
Issue
1-2
Year of publication
1993
Pages
120000027 - 120000029
Database
ISI
SICI code
0304-8853(1993)123:1-2<120000027:POPBMM>2.0.ZU;2-W
Abstract
Parametric excitation of phonons by a microwave magnetic field has bee n performed for the first time in antiferromagnet alpha-Fe2O3 with a h igh Neel temperature. Pumping of phonons is observed at all orientatio ns of microwave and static magnetic fields in the easy plane. The thre shold amplitudes for parallel and perpendicular pumping are measured o ver wide ranges of magnetic fields and temperatures. The relaxation ra te of excited phonons is calculated. Instabilities of different kinds have been observed in the system of parametric phonons.