Magnetoelectric coupling in the multiferroic hybrid-improper ferroelectric <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Ca</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Mn</mml:mi><mml:mrow><mml:mn>1.9</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Ti</mml:mi><mml:mrow><mml:mn>0.1</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>
Yannik Zemp, Morgan Trassin, Elzbieta Gradauskaite, Bin Gao, Sang‐Wook Cheong, Th. Lottermoser, M. Fiebig, Mads C. Weber
Abstract
In hybrid-improper ferroelectrics, two nonpolar structural distortions jointly give rise to a spontaneous electric polarization. In Ca${}_{3}$Mn${}_{1.9}$Ti${}_{0.1}$O${}_{7}$, this ferroelectric state coexists with antiferromagnetism to yield a new type of multiferroic. Here, the authors show that it is characterized by a pronounced magnetoelectric response of the ferroelectric state to the intrinsic magnetic ordering and to external magnetic fields. Optical second harmonic generation is of particular advantage to this study, as it provides access to the electric polarization with spatial resolution of its domains.
Topics & Concepts
MultiferroicsFerroelectricityAntiferromagnetismCondensed matter physicsPolarization densityPolarization (electrochemistry)Materials scienceSecond-harmonic generationPhysicsMagnetizationChemistryMagnetic fieldOpticsOptoelectronicsPhysical chemistryQuantum mechanicsDielectricLaserMultiferroics and related materialsFerroelectric and Piezoelectric MaterialsAdvanced Condensed Matter Physics