Collective Spin Waves in Maxwellian Electron Plasma

Abstract

The problem of collective spin fluctuations in disordered media is still one of the most interesting and intriguing questions in the physics of magnetic phenomena. Metals, alloys, and semiconductors are, of course, the most typical conducting systems with delocalized electron spins. In these cases electrons form a strongly degenerate Fermiliquid in which the exchange interaction between electrons always plays a very important role and can never be neglected. It is the exchange interaction that determines the basic magnetic properties of such systems and gives the predominant contribution to the dynamics of macroscopic magnetization. In particular, the spectrum of spin fluctuations is determined mainly by the magnitude of electron-electron exchange interaction.