Abstract
The static and dynamical Hartree-Fock approximations (HFA) as a conventional approach to the itinerant electron magnetism are insufficient in describing either the equilibrium state or the spin density fluctuations and related physical properties at finite temperatures. Recent theoretical developments have been focussed on improving over HFA by taking account of the mode-mode coupling or the renormalization effect. The self-consistent renormalization theory, as an approach from the weakly ferro- and antiferromagnetic limits, seems to work well in resolving classical difficulties associated with HFA as well as in predicting qualitatively new results on various physical properties of weakly ferro- and antiferromagnetic metals.
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