Accession Number : AD0613977

Title :   FERROMAGNETISM IN THE TRANSITION METALS,

Corporate Author : ILLINOIS UNIV URBANA DEPT OF PHYSICS

Personal Author(s) : Beeby,J. L.

Report Date : 1965

Pagination or Media Count : 45

Abstract : It has been shown that a model in which the saturation magnetisation of an alloy is dependent on the s-d admixture can lead to resonable agreement with experiment. In order to calculate the changes in saturation magnetisation it was necessary to put forward a model for the origin of the ferromagnetism. This model, though very crude, nevertheless suggests important differences between the b.c.c. and f.c.c. lattices, principally in the behavior of the electron-electron correlation energy. Regarding the correlation energy as being the dominant effect in determining the stable lattice structure leads to the correct ranges of stability for the lattice structure as e/a varies for both the ferromagnetic and non-ferromagnetic series. It is clear that an improved version of the itinerant electron model calculation is necessary. This should include the hybridisation of the bands, both s- and d-bands being those for the alloy in question. Some model of the exchange energy must be postulated. Even in the absence of such a first principle calculation of the exchange energy, it is evident that the existing experimental data, especially that concerning the alloys, contains a great deal of information which can be used to resolve some of the remaining difficulties concerning the d-electrons. (Author)

Descriptors :   (*FERROMAGNETISM, TRANSITION METALS), (*TRANSITION METALS, FERROMAGNETISM), ALLOYS, MAGNETIC PROPERTIES, CRYSTAL LATTICES, ATOMIC ENERGY LEVELS, ELECTRON TRANSITIONS, PARTIAL DIFFERENTIAL EQUATIONS, IMPURITIES, CORRELATION TECHNIQUES, ELECTRONS

Distribution Statement : APPROVED FOR PUBLIC RELEASE