EFFECT OF SPIN INJECTION ON THE CONDUCTION-ELECTRON SPIN-RESONANCE ATA FERROMAGNET SEMICONDUCTOR CONTACT

A theory of the electric dipole spin-resonance (EDSR) absorption for c onduction electrons at a ferromagnet-semiconductor interface is given on the basis of quasiclassical transport equations for moments of the spin density matrix. It is supposed that a uniform DC magnetic field i s applied perpendicular to the interfacial contact plane. An electric current passing through the interface is attended by a spin density fl ow which causes polarization of conduction electrons in a semiconducto r. It is shown that spin injection leads to a considerable increase (e xceeding one order of magnitude) of the EDSR signal intensity in semic onductors having the zinc blende or the wurtzite structure.