  We propose a scheme to generate macroscopic superposition states in spin
ensembles, where a coherent driving field is applied to accelerate the
generation of macroscopic superposition states. The numerical calculation
demonstrates that this approach allows us to generate a superposition of two
classically distinct states of the spin ensemble with a high fidelity above
0.96 for 300 spins. For the larger spin ensemble, though the fidelity slightly
decline, it maintains above 0.85 for an ensemble of 500 spins. The time to
generate a macroscopic superposition state is also numerically calculated,
which shows that the significantly shortened generation time allows us to
achieve such macroscopic superposition states within a typical coherence time
of the system.
