Abstract
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) θ–2θ, Φ, and ω scans. The effects of epitaxial strain on the on-site Mn d–d transition energy E dd (T), and the Néel 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.
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Acknowledgements
This project is financially sponsored by the National Science Council (grant no. NSC 98-2112-M-009-006-MY3) and the Ministry of Education (2010 MOE ATU program at NCTU) of Taiwan, R.O.C.
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Wu, K.H., Chen, HJ., Hsieh, C.C. et al. Epitaxial-Strain Effects on Electronic Structure and Magnetic Properties of Hexagonal YMnO3 Thin Films Studied by Femtosecond Spectroscopy. J Supercond Nov Magn 26, 801–807 (2013). https://doi.org/10.1007/s10948-012-2037-8
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DOI: https://doi.org/10.1007/s10948-012-2037-8