Accession Number : AD0720881

Title :   Quantum Theory of Magnetic Materials.

Descriptive Note : Final technical rept.,

Corporate Author : NORTHWESTERN UNIV EVANSTON ILL

Personal Author(s) : Freeman,Arthur J. ; Ellis,Donald E.

Report Date : FEB 1971

Pagination or Media Count : 11

Abstract : The purpose of this project has been to investigate theoretically the origin of the magnetism observed in magnetic materials and to obtain a detailed understanding of the unusual magnetic, electric and optical properties of these systems. Quantum theoretical approaches to the study of the electronic properties of magnetic materials and of solids in general have traditionally followed somewhat different views, the localized model and the itinerant model. This research follows the philosophy that a fundamental description of the physics of electrons in solids is found in an approach which lies somewhere in between these two extremes. The results of these theoretical calculations are closely correlated with data obtained from experiments such as Mossbauer effect, NMR, neutron diffraction and Fermi surface studies. The investigations fall into three main areas, studies of the electronic band structure of magnetic materials like the actinide metals and their compounds, studies of covalency and superexchange in antiferromagnetic insulating materials involving 3d transition metal, 4f rare-earth, and 5f actinide metal ions, and development of a tight binding method in order to include into one scheme the principal advantages developed. (Author)

Descriptors :   (*MAGNETIC MATERIALS, BAND THEORY OF SOLIDS), (*FERROMAGNETISM, SOLID STATE PHYSICS), (*ANTIFERROMAGNETISM, SOLID STATE PHYSICS), NICKEL, IRON, PALLADIUM, PLATINUM, GRAPHITE, CHEMICAL BONDS, HYPERFINE STRUCTURE

Subject Categories : Electricity and Magnetism
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE