Abstract
The Green function theory, which has been used hitherto for ferro- and antiferromagnetism, has been extended for the case of a two-sublattice ferrimagnet. Two parametrized Green functions are used corresponding to the two sublattices. The equations of motion are set up and the higher order Green functions are decoupled according toCallen's approximation. The functions are obtained by solving the simultaneous equations. The quasi-particle energies are evaluated from the singularities of the Green functions and the magnetization at low temperatures is found to obey theT 3/2-law. These results obtained for the energy and magnetization agree well with those obtained by the conventional spin wave method.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Communication No. 922 from National Chemical Laboratory, Poona-India.
The author is profoundly indebted to Dr. K.P.Sinha for his keen interest in this work and constant encouragement, to Dr. U.N.Upadhyaya for helpful discussions and to the Council of Scientific and Industrial Research, New Delhi, India, for the award of a fellowship during this period.
Rights and permissions
About this article
Cite this article
Joshi, A.W. Application of the Green's function method to ferrimagnetism. Z. Physik 199, 290–298 (1967). https://doi.org/10.1007/BF01332390
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01332390