LAUSR

This paper describes the dynamics of three-component superlattices consisting of non-ferroelectric and anti-ferromagnetic NdMnO3/SrMnO3/LaMnO3 layers. Using a femtosecond pump-probe method, two acoustic phonons are observed at frequencies of 49 and 19 GHz, respectively. The temperature dependence of the acoustic phonon follows a similar trend to that of the magnetic phase transition. Surprisingly, one phonon responds strongly to an external magnetic field. The results support the existence of magneto-electric coupling in the superlattice induced by interfacial effects between the non-ferroelectric and anti-ferromagnetic layers and suggest the possible development of ultrafast magneto-tunable devices.