Accession Number:

AD0613977

Title:

FERROMAGNETISM IN THE TRANSITION METALS,

Descriptive Note:

Corporate Author:

ILLINOIS UNIV URBANA DEPT OF PHYSICS

Personal Author(s):

Report Date:

1965-01-01

Pagination or Media Count:

45.0

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 ea 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

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE