Coulomb drag, magnetoresistance, and spin-current injection in magnetic multilayers

✍ Scribed by G. Vignale; Irene D'Amico

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 140 KB
• Volume: 127
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/s0038-1098(03)00578-7

✦ Synopsis

We study the effect of spin Coulomb drag on the magnetoresistance and the spin-current injection efficiency of a layered structure consisting of a nonmagnetic semiconductor sandwiched between two ferromagnetic electrodes of spin polarization p: The calculations are done within the framework of the drift-diffusion theory, which we generalize to include the spin transconductivity s "# : We find that for p close to 100% the spin drag enhances the magnetoresistance, while for smaller values of p it reduces it. A new approach to the measurement of s "# is suggested.