Coherent magnon and acoustic phonon dynamics in tetragonal and rare-earth-doped BiFeO3 multiferroic thin films - Doig,KI; Aguesse,F; Axelsson,AK; Alford,NM; Nawaz,S; Palkar,VR; Jones,SPP; Johnson,RD; Synowicki,RA; Lloyd-Hughes,J (PHYSICAL REVIEW B, 2013)