  We study the nonlocal spin and charge current generation in a finite metallic
element on the surface of magnetic insulators such as \tcb{yttrium iron garnet}
due to the absorption of the magnetic surface plasmon (MSP). Whereas a surface
plasmon is completely reflected by a metal, \tcb{an} MSP \tcb{can be} absorbed
\tcb{due to the absence of backward states}. The \tcb{injection of} MSP
generates a voltage in the longitudinal direction parallel to the wave vector,
\tcb{with the voltage} proportional to input power. If the metal is a
ferromagnet, a spin current can also be \tcb{induced} in the longitudinal
direction. Our \tcb{results provide a way to improve upon} integrated circuits
of spintronics and spin wave logic devices.
