title: Analysis of the multiferroicity in the hexagonal manganite YMnO3.
abstract: We performed magnetic and ferroelectric measurements, associated with Landau theory and symmetry analysis, in order to clarify the situation of the YMnO3 system, a classical example of type I multiferroics. We found that the only magnetic group compatible with all experimental data (neutron scattering, magnetization, polarization, dielectric constant, second harmonic generation) is the P6'(3) group. In this group a small ferromagnetic component along c is induced by the Dzyaloshinskii-Moriya interaction, and observed here in magnetization measurements. We found that the ferromagnetic and antiferromagnetic components can only be switched simultaneously, while the magnetic orders are functions of the polarization square and therefore insensitive to its sign.
authors.affiliation: CRISMAT, CNRS-ENSICAEN, Caen, France.
authors.forename: Kiran
authors.initials: K
authors.lastname: Singh
authors.forename: Marie-Bernadette
authors.initials: MB
authors.lastname: Lepetit
authors.forename: Charles
authors.initials: C
authors.lastname: Simon
authors.forename: Natalia
authors.initials: N
authors.lastname: Bellido
authors.forename: Stéphane
authors.initials: S
authors.lastname: Pailhès
authors.forename: Julien
authors.initials: J
authors.lastname: Varignon
authors.forename: Albin
authors.initials: A
authors.lastname: De Muer
mesh_terms: D003198:Computer Simulation; D060526:Magnetic Fields; D017895:Manganese Compounds / Q000737:chemistry*; D008422:Materials Testing; D008956:Models, Chemical; D008958:Models, Molecular
chemical_list: D017895:Manganese Compounds; C494384:manganite