Epitaxial-strain effects on electronic structure and magnetic properties of hexagonal YMnO3 thin films studied by femtosecond spectroscopy

Kaung-Hsiung Wu*, H. J. Chen, C. C. Hsieh, Chih-Wei Luo, T. M. Uen, Jiunn-Yuan Lin, Jenh-Yih Juang

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Scopus citations

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 Edd (T), and the Néel temperature (TN) in these thin films are investigated by wavelength-tunable ultrafast pump-probe techniques. We find that the changes of Edd (T) and TN 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.

Original languageEnglish
Pages (from-to)801-807
Number of pages7
JournalJournal of Superconductivity and Novel Magnetism
Volume26
Issue number4
DOIs
StatePublished - 1 Apr 2013

Keywords

  • Crystalline structures
  • Hexagonal YMnO thin films
  • Magnetization measurement
  • Strain effect
  • Temperature-dependent Mn d to d transition energy

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