  Quantum corrections of the biquadratic interaction in the 1D spin-1/2
frustrated ferromagnetic Heisenberg model are studied. The biquadratic
interaction for spin-1/2 chains is eliminated and transformed to the quadratic
interaction. Doing a numerical experiment, new insight as to how the classical
phases get modified on the inclusion of quantum fluctuations is provided.
Observed results suggest the existence of an intermediate region in the ground
state phase diagram of the frustrated ferromagnetic spin-1/2 chains with
combination of dimer and chiral orders. In addition, from the quantum
entanglement view point, differences between quantum phases are also obtained.
The nearest neighbor spins never be entangled in the frustrated ferromagnetic
chains but are entangled up to the Majumdar-Ghosh point in the frustrated
antiferromagnetic chains. On the other hand, the next nearest neighbor spins in
the mentioned intermediate region are entangled.
