Abstract
A semiquantitative model of circular magneto-optical effects in iron garnets is constructed within the concept of charge-transfer transitions and the existing qualitative notions. In the framework of the proposed model, the drastic enhancement of circular magneto-optical effects in R 3Fe5O12 iron garnets containing impurities of Bi3+ or Pb2+ ions is explained by the increase in the oxygen contribution to the spin-orbit coupling constant of the (FeO6)9− and (FeO4)5− complexes (the main magneto-optically active centers in iron garnets). This increase is associated with the covalent admixture of the Bi3+ (or Pb2+) 6p orbitals (with a giant one-electron spin-orbit coupling constant) to the oxygen 2p orbitals. The influence of the substitution does not reduce to an enhancement of the oxygen spin-orbit interaction alone but also leads to the appearance of the effective anisotropic tensor contributions to the spin-orbit interaction and circular magneto-optical effects. These contributions to the magneto-optical effects in garnets are estimated. The influence of an inhomogeneous bismuth distribution on the magneto-optical effects in Y3−x BixFe5O12 garnets is investigated using computer simulation. Analysis of the available experimental data on the magneto-optical effects in garnets confirms the validity of the theoretical model proposed.
Similar content being viewed by others
References
G. B. Scott, D. E. Lacklison, and J. L. Page, Phys. Rev. B 10(3), 971 (1974).
S. Wittekoek, T. J. A. Popma, J. M. Robertson, and P. F. Bongers, Phys. Rev. B 12(7), 2777 (1975).
K. Shinagawa, in Magnetooptics, Ed. by S. Sugano and N. Kojima (Springer-Verlag, Berlin, 1999), pp. 137–177.
S. Wittekoek and D. E. Lacklison, Phys. Rev. Lett. 28(12), 740 (1972).
A. S. Moskvin and A. V. Zenkov, Solid State Commun. 80(9), 739 (1991).
D. A. Varshalovich, A. N. Moskalev, and V. K. Khersonskii, Quantum Theory of Angular Momentum (Nauka, Leningrad, 1975; World Scientific, Singapore, 1988).
J. J. Krebs and W. G. Maisch, Phys. Rev. B 4(3), 757 (1971).
A. V. Zenkov and A. S. Moskvin, Fiz. Tverd. Tela (Leningrad) 32(12), 3674 (1990) [Sov. Phys. Solid State 32, 2131 (1990)].
A. S. Moskvin, A. V. Zenkov, E. I. Yuryeva, and V. A. Gubanov, Physica B (Amsterdam) 168(1), 187 (1991).
E. A. Gan’shina, A. V. Zenkov, S. V. Koptsik, et al., Available from VINITI, No. 788-V90 (Sverdlovsk, 1990).
A. V. Zenkov, Author’s Abstract of Candidate’s Dissertation (Sverdlovsk, 1990).
International Tables for X-ray Crystallography (Kynoch, Birmingham, 1952), Vol. 1.
B. V. Mill’, Magnetic and Crystal Chemical Studies of Ferrites (Mosk. Gos. Univ., Moscow, 1971), p. 56.
Author information
Authors and Affiliations
Additional information
__________
Translated from Fizika Tverdogo Tela, Vol. 44, No. 10, 2002, pp. 1811–1818.
Original Russian Text Copyright © 2002 by Moskvin, Zenkov.
Rights and permissions
About this article
Cite this article
Moskvin, A.S., Zenkov, A.V. Bismuth-induced enhancement of magneto-optical effects in iron garnets: A theoretical analysis. Phys. Solid State 44, 1898–1906 (2002). https://doi.org/10.1134/1.1514779
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1134/1.1514779