| Issue |
J. Phys. Colloques
Volume 49, Number C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|---|---|---|
| Page(s) | C8-1611 - C8-1612 | |
| DOI | https://doi.org/10.1051/jphyscol:19888738 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-1611-C8-1612
DOI: 10.1051/jphyscol:19888738
Physik-Department T30, Technische Universität München, D-8046 Garching, F.R.G.
J. Phys. Colloques 49 (1988) C8-1611-C8-1612
DOI: 10.1051/jphyscol:19888738
SPIN WAVES OF A LAYERED FERROMAGNETIC ELECTRON GAS AND OF A PARAMAGNETIC ELECTRON GAS IN A STRONG MAGNETIC FIELD
W. Gasser et C. TäuberPhysik-Department T30, Technische Universität München, D-8046 Garching, F.R.G.
Abstract
The spin wave spectrum of a layered ferromagnetic electron system is determined in the long-wave length limit. It is shown that the spin wave stiffness is a highly anisotropic quantity. A discussion of the Stoner condition shows that both electron tunneling processes and a more sophisticated expression of the Coulomb interaction matrix element than the usual Hubbard form are important for the existence of ferromagnetic ordering. The results are compared with those for excitations of a paramagnetic layered electron gas in a strong external magnetic field.