Electron Acoustic Effects in Metallic Magnetic Multilayers
The main properties of metallic magnetic multilayers (superlattice) of Fe/Cr type such as the type of magnetic ordering, dependence of electrical resistance on the magnetic field are defined by itinerant electrons. However, sufficiently complete theory of electron states in these multilayered metallic systems has not been developed up to now. Therefore, there are considerable difficulties, in particular, in the rigorous treatment of the mechanisms of the giant magnetoresistance and the role of intermediate nonmagnetic layers in forming the antiparallel and noncollinear magnetic structures . These difficulties are mainly due to the deficit of experimental data on electron parameters. In the present paper we notice new possibilities which can be of interest in studying the propagation of elastic waves in metallic multilayers. At low temperatures the ultrasonic absorption and dependence of acoustic parameters on the magnetic field are defined by itinerant electrons. We have developed quasi-classical kinetic theory of electron magnetoacoustic effects in multilayers in the frameworks of the model of imperfect boundaries proposed in . The results obtained allow us to describe the dependencies of effective elastic moduli on the magnetization and magnetic field strength. These dependencies are defined both by the parameters of electron structure and the defects of interfaces. We can estimate what of these factors is dominating.
KeywordsAcoustic Parameter Ferromagnetic Layer Neighbor Layer Giant Magnetoresistance Spin Splitting
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