標題: | Epitaxial-Strain Effects on Electronic Structure and Magnetic Properties of Hexagonal YMnO3 Thin Films Studied by Femtosecond Spectroscopy |
作者: | Wu, K. H. Chen, H. -J. Hsieh, C. C. Luo, C. W. Uen, T. M. Lin, J. -Y. Juang, J. Y. 電子物理學系 物理研究所 Department of Electrophysics Institute of Physics |
關鍵字: | Hexagonal YMnO3 thin films;Strain effect;Crystalline structures;Temperature-dependent Mn d to d transition energy;Magnetization measurement |
公開日期: | 1-四月-2013 |
摘要: | In this paper, (001)-oriented hexagonal YMnO3 (h-YMO) thin films with various nominal strain states were deposited on MgO(100), MgO(111), and YSZ(111) substrates by pulsed laser deposition. The in-plane orientation alignment and substrate-induced epitaxial strain between the h-YMO films and substrates are examined by X-ray diffraction (XRD) theta-2 theta, I broken vertical bar, and omega scans. The effects of epitaxial strain on the on-site Mn d-d transition energy E (dd) (T), and the N,el temperature (T (N)) in these thin films are investigated by wavelength-tunable ultrafast pump-probe techniques. We find that the changes of E (dd) (T) and T (N) depend on the type and magnitude of the epitaxial strain. The possible mechanisms for the observed strain effect on the electronic structure and associated magnetism are discussed. |
URI: | http://dx.doi.org/10.1007/s10948-012-2037-8 http://hdl.handle.net/11536/21506 |
ISSN: | 1557-1939 |
DOI: | 10.1007/s10948-012-2037-8 |
期刊: | JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM |
Volume: | 26 |
Issue: | 4 |
起始頁: | 801 |
結束頁: | 807 |
顯示於類別: | 會議論文 |