DPG Phi
Verhandlungen
Verhandlungen
DPG

SKM 2021 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

MA: Fachverband Magnetismus

MA 15: Posters Magnetism IV

MA 15.42: Poster

Thursday, September 30, 2021, 13:30–16:30, P

Coupling of magnetic and electric order in hybrid improper ferroelectric Ca3Mn1.9Ti0.1O7 — •Yannik Zemp1, Mads C. Weber1, Thomas Lottermoser1, Morgan Trassin1, Bin Gao2, Sang-Wook Cheong2, and Manfred Fiebig11Department of Materials, ETH Zurich — 2Rutgers University, New Jersey

Multiferroic hybrid improper ferroelectrics such as Ca3Mn1.9Ti0.1O7 (CMTO) provide a novel mechanism to couple ferroelectricity and ferromagnetism. Both ferroic orders are induced by the same structural distortions. Theoretically, these structural distortions allow an electrical control of the magnetic order. Experimental evidence of such a coupling is lacking, however, because high leakage currents prevent contact-based electrical measurements. Here we use two complementary non-contact methods, namely SQUID magnetometry and optical second harmonic generation (SHG) to scrutinize the magnetic and polar orders and their coupling in CMTO. We find clear evidence for a ferromagnetic moment below TN = 115 K. Furthermore, we detect a massive increase in the SHG signal below the magnetic ordering temperature. Using SHG spectroscopy and domain analysis, we unveil the origin of this increase as a direct influence of the magnetic order on the ferroelectric state. This work shows that the magnetic and polar orders in multiferroic hybrid improper ferroelectrics can indeed be strongly coupled.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2021 > SKM