Conclusions
It has been found that the character of the magnetic anisotropy changes markedly when the Co + Ge YIG films are doped with calcium. For the induced uniaxial and in-plane anisotropy we observe an increasing departure from the predictions based on the two-parameter model and for the cubic anisotropy the constantK 1 becomes dependent on the growth direction. As a source for the latter effect the octahedral or tetrahedral preference of Co ions depending on the growth direction may be considered. The measured linewidth proportional to frequency indicates the presence of a relaxation mechanism which is, probably, connected with octahedral Co3+ ions.
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Dedicated to Jan Kaczér DrSc on the occasion of his 65th birthday.
The authors express their thanks to Dr. P. Görnert and M. Nevřiva for preparation of the LPE films and to Dr. P. Novák for valuable discussions.
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Maryško, M., Šimšová, J. Ferromagnetic resonance study of Y3−z Ca z Fe5−x−y Co x Ge y O12 films. Czech J Phys 34, 1125–1135 (1984). https://doi.org/10.1007/BF01590107
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DOI: https://doi.org/10.1007/BF01590107