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We investigate magnetization reversal of two-body uniaxial Stoner particles,by injecting spin-polarized current through a spin-valve structure.The two-body Stoner particles perform synchronized dynamics and can act as an information bit in computer technology.In the presence of magnetic dipole--dipole interaction (DDI) between the two particles,the critical switching current Ic for reversing the two dipoles is analytically obtained and numerically verified in two typical geometric configurations.The Ic bifurcates at a critical DDI strength,where Ic can decrease to about 70% of the usual value without DDI.Moreover,we also numerically investigate the magnetic hysteresis loop,magnetization self-precession,reversal time and synchronization stability phase diagram for the two-body system in the synchronized dynamics regime.