  We study the long-range triplet Josephson current in a clean junction
composed of two s-wave superconductors and a
normal-metal/ferromagnet/normal-metal trilayer. Through applying the bias
voltages on the metal regions by two antiparallel half-metal electrodes, we
show that the amplitude and direction of this long-range current can be
controlled easily and flexibly. Such current arises from the fact that the
applied voltage can produce a nonequilibrium spin-dependent quasiparticle
distribution in the metal regions so that the Cooper pairs acquire an extra
momenta, which will lead to a spin-flip processes in the metal regions. This
processes can produce the parallel spin triplet pairs in the central
ferromagnet layer. In particular, if the voltage is applied only on one metal
region, we further find that the recently discovered long-range superharmonic
Josephson current will appear because of the transport of an even number of
parallel spin triplet pairs.
