Modulation of pure spin currents with a ferromagnetic insulator
  We propose and demonstrate spin manipulation by magnetically controlled modulation of pure spin currents in cobalt/copper lateral spin valves, fabricated on top of the magnetic insulator Y$_3$Fe$_5$O$_{12}$ (YIG). The direction of the YIG magnetization can be controlled by a small magnetic field. We observe a clear modulation of the non-local resistance as a function of the orientation of the YIG magnetization with respect to the polarization of the spin current. Such a modulation can only be explained by assuming a finite spin-mixing conductance at the Cu/YIG interface, as it follows from the solution of the spin-diffusion equation. These results open a new path towards the development of spin logics. 
Estitxu Villamor, Miren Isasa, Sa\"ul V\'elez, Amilcar Bedoya-Pinto,   Paolo Vavassori, Luis E. Hueso, F. Sebastian Bergeret...
cond-mat.mes-hall cond-mat.mtrl-sci