作者: Nara Lee , Young Jai Choi , Sang-Wook Cheong
DOI: 10.1063/1.4866187
关键词: Néel temperature 、 Multiferroics 、 Ferroelectricity 、 Materials science 、 Magnetoelectric effect 、 Condensed matter physics 、 Poling 、 Perpendicular 、 Magnetic field 、 Polarization (waves)
摘要: We have discovered strong magnetoelectric (ME) effects in the single chiral-helical magnetic state of single-crystalline langasite Ba3NbFe3Si2O14 that is crystallographically chiral. The ferroelectric polarization, predominantly aligned along the a axis below the Nèel temperature of∼ 27 K, changes in a highly non-linear fashion in the presence of in-plane magnetic fields (H) perpendicular to the a axis (H//b*). This ME effect as well as smaller ME effects in other directions exhibit no poling dependence, suggesting the presence of a self …