  We have carried out a unified microscopic study of electric monopole,
quadrupole and magnetic dipole excitations in fast rotating nuclei undergoing
backbending, with special attention at the magnetic excitations. We found,
among other results, that the strength of the orbital magnetic dipole
excitations (scissors mode) gets enhanced by more than a factor four at high
rotational frequency, above the backbending region. We provide a physical
explanation for such an enhancement.
