Microwave-induced spin currents in ferromagnetic-insulator|normal-metal bilayer system

A microwave technique is employed to simultaneously examine the spin pumping and the spin Seebeck effect processes in a YIG vertical bar Pt bilayer system. The experimental results show that for these two processes, the spin current flows in opposite directions. The temporal dynamics of the longitudinal spin Seebeck effect exhibits that the effect depends on the diffusion of bulk thermal-magnons in the thermal gradient in the ferromagnetic-insulator vertical bar normal-metal system. (C) 2014 AIP Publishing LLC.