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Effect of (1 1 1)-oriented strain on the structure and magnetic properties of La0.7Sr0.3MnO3thin films

  • Author(s): Bolstad, T
  • Lysne, E
  • Hallsteinsen, I
  • Arenholz, E
  • Osterberg, UL
  • Tybell, T
  • et al.
Abstract

© 2018 IOP Publishing Ltd. Using strain, i.e. subtle changes in lattice constant in a thin film induced by the underlying substrate, opens up intriguing new ways to control material properties. We present a study of the effects of strain on structural and ferromagnetic properties of (1 1 1)pc-oriented La0.7Sr0.3MnO3epitaxial thin films grown on NdGaO3, SrTiO3, and DyScO3substrates. (The subscript pc denotes the pseudo-cubic symmetry.) The results show that La0.7Sr0.3MnO3assumes a monoclinic unit cell on NdGaO3and DyScO3and a rhombohedral unit cell on SrTiO3. For La0.7Sr0.3MnO3on NdGaO3and DyScO3a uniaxial magnetic anisotropy is found, while La0.7Sr0.3MnO3on SrTiO3is magnetically isotropic. The Néel model is used to explain the anisotropy of the thin films on NdGaO3and SrTiO3, however, for La0.7Sr0.3MnO3on DyScO3the effect of octahedral rotations needs to be included through the single ion model. Through examination of the Curie temperature of the strained films we suggest that (1 1 1)-strain has a different effect on the Jahn-Teller splitting of egand t2gelectron levels than what is seen in (0 0 1)pc-oriented La0.7Sr0.3MnO3thin films.

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