Cycloidal order in orthorhombic rare earth magnanites induces ferroelectricity in centro-symmetric compounds. This evidences a tight link between dielectric and magnetic properties, both depending on lattice strain. For instance, in thin films, SrTiO3(110) substrate-induced epitaxial strain is known to open the Mn-O-Mn bonding angles of YMnO3 films and unavoidably modify the magnetic super-exchange interactions. In an experiment carried out at D10 we identified magnetic peaks which persist up to 100 K and vanish at higher temperatures. This high ordering temperature markedly surpasses the bulk T_N~40 K and is in contradiction with temperature dependence magnetization data. Complementary experiments carried out at CYCLOPS experiments by local contact B. Ouladdiaf confirmed our observation of T_N~100 K while some magnetic peaks did vanish at T~N=40 K in agreement with bulk compounds.In this proposal we want to study in detail the temperature dependence of a magnetic peak belonging to the phase with T_N~40 K like bulk and a peak belonging to the high-temperature phase. Scans along b direction (Pbnm) will investigate the cycloidal order responsible for ferroelectricity.