  We investigate the competition of magnetic reconnections in self-generated
and external magnetic fields in laser-produced plasmas. The temporal evolution
of plasma structures measured with self-emission imaging shows the vertical
expansions and horizontal separation of plasma, which can be signatures of
reconnection outflows in self-generated and external magnetic fields,
respectively. Because the outflows in self-generated magnetic fields are not
clear in the presence of the external magnetic field, the external magnetic
field can suppress the magnetic reconnection in self-generated magnetic fields.
