Strain Induced Anomalous Magnetic Ordering in Epitaxial TbMnO₃ Thin Films

Abstract:

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, 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 inducde by the interface strain between the films and the substrates.

• Periodical: Advanced Materials Research (Volume 787)
• Pages: 269-273
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.787.269
• Online since: September 2013
• Authors: Wei Tian Wang, Ping Gao, Wei Zhang
• Keywords: Magnetic Property, Perovskite, Strain, Thin Film

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