Changes in spin and lattice dynamics induced by magnetic and structural phase transitions in multiferroic ${\rm SrMn}_7{\rm O}_{12}$

Stanislav Kamba,1,* Veronica Goian,1 Filip Kadlec,1 Dmitry Nuzhnyy,1 Christelle Kadlec,1 Jakub Vít,1,2,3 Fedir Borodavka,1 Iana S. Glazkova,4 and Alexei A. Belik5 1Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 182 21 Prague 8, Czech Republic 2Faculty of Nuclear Science and Physical Engineering, Czech Technical University, Břehová 7, 115 19 Prague 1, Czech Republic 3Department of Physics, Budapest University of Technology and Economics, H-1111 Budapest, Hungary 4Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 119992 Moscow, Russia 5Research Center for Functional Materials, National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan