DocumentCode :
1002551
Title :
Origin of coercivity of Ca - Ge substituted epitaxial YIG crystals
Author :
Pardavi-Horváth, M. ; Cziraki, A. ; Fellegvari, I. ; Vertesy, G. ; Vandlik, J. ; Keszei, B.
Author_Institution :
Central Research Institute of Physics, Budapest, Hungary.
Volume :
20
Issue :
5
fYear :
1984
fDate :
9/1/1984 12:00:00 AM
Firstpage :
1123
Lastpage :
1125
Abstract :
LPE grown, substituted YIG crystals have coercivities (Hc ) in the 10-1Oe range, depending on compositions and growth conditions. Dislocations, inclusions and surfaces cannot be fully responsible for the observed Hc . TEM investigations of CaGeSmYIG films have revealed a periodically modulated stress field that - via magnetostrictive stresses - may explain the FMR line broadening and the measured Hc . Stresses of 107dyne cm-2and 
with a periodicity of 500 Å produce 
Oe corresponding to a periodic fluctuation of Sm or Ca-Ge content by 1-3%. The mechanism, thought to be the spinodal decomposition of the garnet, causes FMR line broadening up to 200-300 Oe, i.e. more than the relaxation of Sm3+ions.
with a periodicity of 500 Å produce Oe corresponding to a periodic fluctuation of Sm or Ca-Ge content by 1-3%. The mechanism, thought to be the spinodal decomposition of the garnet, causes FMR line broadening up to 200-300 Oe, i.e. more than the relaxation of Sm3+ions.Keywords :
Coercive forces; Magnetic bubble films; YIG films/devices; Coercive force; Crystals; Garnet films; Helium; Internal stresses; Magnetic field measurement; Magnetic films; Magnetic modulators; Magnetostriction; Microstructure;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.1984.1063147
Filename :
1063147
Link To Document :
