| Numéro |
J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|
|---|---|---|
| Page(s) | C8-985 - C8-986 | |
| DOI | https://doi.org/10.1051/jphyscol:19888451 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-985-C8-986
DOI: 10.1051/jphyscol:19888451
1 The Ohio State University, Columbus, OH 43210, U.S.A.
2 On leave from the Central Research Institute for Physics, Budapest, Hungary.
3 Institute of Solid State Electronics, Rome, Italy
J. Phys. Colloques 49 (1988) C8-985-C8-986
DOI: 10.1051/jphyscol:19888451
MAGNETIZATION ANOMALIES IN Ca2+ (Fe4+) DOPED YIG DILUTED WITH Ga OR Sc
M. Pardavi-Horvath1, 2, P. E. Wigen1 et P. DeGasperis31 The Ohio State University, Columbus, OH 43210, U.S.A.
2 On leave from the Central Research Institute for Physics, Budapest, Hungary.
3 Institute of Solid State Electronics, Rome, Italy
Abstract
The measurements of the temperature dependence of the magnetization of Cx2+My3+ : YIG (M3+= Ga, Sc ; 0.1 ≤ x ≤ 0.3 ; 0 ≤ y ≤ 1.5) single crystal films has shown a 5-100 % decrease of the magnetization at low temperatures compared to the two-sublattice Néel-model. The anomalies are due to charge compensating Fe4+ ions, formed via a temperature dependent localization process of the extra hole introduced by the Ca2+ ; the canting of the unsubstituted sublattice ; and the low temperature ordering of the paramagnetic Fe3+ ions having less than two magnetic neighbors.