  Ultrafast optical pump-probe spectroscopy is used to reveal the coexistence
of coupled antiferromagnetic/ferroelectric and ferromagnetic orders in
multiferroic TbMnO3 films through their time domain signatures. Our
observations are explained by a theoretical model describing the coupling
between reservoirs with different magnetic properties. These results can guide
researchers in creating new kinds of multiferroic materials that combine
coupled ferromagnetic, antiferromagnetic and ferroelectric properties in one
compound.
