Effect of (1 1 1)-oriented strain on the structure and magnetic properties of La0.7Sr0.3MnO3 thin films

Bolstad, T.; Lysne, E.; Hallsteinsen, I.; Arenholz, E.; Osterberg, U. L.; Tybell, T.

doi:10.1088/1361-648X/aac468

Effect of (1 1 1)-oriented strain on the structure and magnetic properties of La_0.7Sr_0.3MnO₃ thin films

Journal Article · Thu May 31 00:00:00 EDT 2018 · Journal of Physics. Condensed Matter

DOI:https://doi.org/10.1088/1361-648X/aac468· OSTI ID:1460335

Bolstad, T. ^[1]; Lysne, E. ^[1]; Hallsteinsen, I. ^[2]; Arenholz, E. ^[3]; Osterberg, U. L. ^[1]; ^[1]

Norwegian Univ. of Science and Technology, Trondheim (Norway). Dept. of Electronic Systems
Norwegian Univ. of Science and Technology, Trondheim (Norway). Dept. of Electronic Systems; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

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 La_0.7Sr_0.3MnO₃ epitaxial thin films grown on NdGaO₃, SrTiO₃, and DyScO₃ substrates. (The subscript pc denotes the pseudo-cubic symmetry.) The results show that La_0.7Sr_0.3MnO₃ assumes a monoclinic unit cell on NdGaO₃ and DyScO₃ and a rhombohedral unit cell on SrTiO₃. For La_0.7Sr_0.3MnO₃ on NdGaO₃ and DyScO₃ a uniaxial magnetic anisotropy is found, while La_0.7Sr_0.3MnO₃ on SrTiO₃ is magnetically isotropic. The Néel model is used to explain the anisotropy of the thin films on NdGaO₃ and SrTiO₃, however, for La_0.7Sr_0.3MnO₃ on DyScO₃ the effect of octahedral rotations needs to be included through the single ion model. Finally, 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 e_g and t_2g electron levels than what is seen in (0 0 1)_pc-oriented La_0.7Sr_0.3MnO₃ thin films.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1460335

Alternate ID(s):: OSTI ID: 23009465

Journal Information:: Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 25 Vol. 30; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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