Magnons and acoustic phonons in Y3-xBixFe5O12 - art. no. 094421

Citation
Gg. Siu et al., Magnons and acoustic phonons in Y3-xBixFe5O12 - art. no. 094421, PHYS REV B, 6409(9), 2001, pp. 4421
Citations number
52
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
0163-1829 → ACNP
Volume
6409
Issue
9
Year of publication
2001
Database
ISI
SICI code
0163-1829(20010901)6409:9<4421:MAAPIY>2.0.ZU;2-P
Abstract
We use Brillouin light scattering (BLS) to study a series of single-crystal Bi-doped yttrium iron garnet Y3-xBixFe5O12 (Bi-YIG) prepared with x = 0, 0 .14, 0.36, 0.54, and 0.92. BLS shows that the optimal laser power should be as low as possible, less than or equal to5 mW. BLS manifests the Bi-concen tration dependence of the magnetic and mechanic properties of Bi-YIG. Two b ulk magnons are observed. One is the thermally excited magnon and another i s the uniform magnetostatic mode. The stiffness constant D-ex, the relative intensity and bandwidth (full width at half maximum) of the thermally exci ted bulk magnon all increase linearly with x, while 4 piM, is insensitive t o doping. On the contrary, the scattering intensity and the sound velocity of the acoustic phonon decrease.