Orthorhombic c-axis-oriented TbMnO3 films of 24~200 nm thickness were grown epitaxially on SrTiO3 (001) single crystal substrates by using pulsed laser deposition technique. The temperature (2~300 K) dependence of magnetization data were obtained on a quantum design superconducting quantum interference device. When the magnetic field was applied in the a-b plane, apart from the three magnetic ordering transitions at low temperatures (10 K, 21 K and 43 K), the magnetization evidently displayed an anomalous antiferromagnetic ordering around 156 K, which was related to the film thickness seriously. A broad transition peak at the same temperature was also observed when the applied field was along the c axis direction. The anomalies at high temperature were not observed in bulk TbMnO3 materials. These results were discussed in terms of unexpected magnetic ordering of the Mn3+ moments induced by the interface strain between the films and the substrates.
|Anomalous Magnetic Ordering in Epitaxial TbMnO3 Ultrathin Films||Jan 25, 2021|
Z. H. Mkhitaryan A. A. Shatveryan F. V. Gasparyan
F. V. Gasparyan S. V. Melkonyan H. V. Asriyan C. E. Korman B. Noaman A. H. Arakelyan A. A. Shatvetyan A. M. Avetisyan
V. A. Gevorkyan K. M. Gambaryan M. S. Kazaryan
V. Arakelyan V. E. Galstyan G. Shahnazaryan
A. A. Tshantshapanyan K. G. Dvoyan E. M. Kazaryan
V. E. Galstyan