Detail publikace

Tailoring interface epitaxy and magnetism in La1-xSrxMnO3/SrTiO3 heterostructures via temperature-driven defect engineering

Molinari, A. Gorji, S. Michalicka, J. Kubel, C. Hahn, H. Kruk, R.

Originální název

Tailoring interface epitaxy and magnetism in La1-xSrxMnO3/SrTiO3 heterostructures via temperature-driven defect engineering

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

Defect engineering of La1-xSrxMnO3 (LSMO)-a strongly correlated oxide displaying half metallicity and ferromagnetism above room temperature-has been the focus of a long-standing quest aimed at the exploitation of this material as a functional building block for memory storage and spintronic applications. Here, we discuss the correlation between structural defects and magnetism in La1-xSrxMnO3/SrTiO3 (LSMO/STO) epitaxial heterostructures as a function of growth temperature and post-deposition annealing. Upon increasing the growth temperature from 500 to 700 degrees C at a fixed oxygen partial pressure of 0.007 mbar, the sputter-deposited epitaxial LSMO films experience a progressive increase in Curie temperature T-c from 110 to 270 K and saturation magnetization M-s from 1.4 to 3.3 mu(B)/u.c. owing to a reduction in oxygen deficiencies. Concurrently, however, growth temperatures above 600 degrees C trigger the formation of off-stoichiometric, dendritic-like SrMoOx islands at the film/substrate interface as a possible aftermath of temperature-driven diffusion of impurities from the STO substrate. Notably, although the interfacial spurious islands cause an increase in sample surface roughness, the heterostructure still preserves high-quality epitaxy. In general, the best compromise in terms of both structural and magnetic properties, comprising high-quality epitaxy, atomically flat surface, and robust ferromagnetism above room temperature, is obtained for LSMO films grown at a relatively low temperature of about 500-540 degrees C followed by a post-deposition annealing treatment at 900 degrees C for 1 h in air. Our study compares effective routes based on temperature-controlled defect engineering to finely tailor the complex interplay between microstructure and magnetism in LSMO thin films. (C) 2022 Author(s).

Klíčová slova

ROOM-TEMPERATURE; SRTIO3; MAGNETORESISTANCE; MANGANITES; CHEMISTRY

Autoři

Molinari, A.; Gorji, S. ; Michalicka, J.; Kubel, C.; Hahn, H.; Kruk, R.

Vydáno

14. 9. 2022

Nakladatel

AIP Publishing

Místo

MELVILLE

ISSN

1089-7550

Periodikum

Journal of Applied Physics

Ročník

132

Číslo

10

Stát

Spojené státy americké

Strany počet

8

URL

https://aip.scitation.org/doi/10.1063/5.0095406

BibTex

@article{BUT182343,
  author="Molinari, A. and Gorji, S. and Michalicka, J. and Kubel, C. and Hahn, H. and Kruk, R.",
  title="Tailoring interface epitaxy and magnetism in La1-xSrxMnO3/SrTiO3 heterostructures via temperature-driven defect engineering",
  journal="Journal of Applied Physics",
  year="2022",
  volume="132",
  number="10",
  pages="8",
  doi="10.1063/5.0095406",
  issn="1089-7550",
  url="https://aip.scitation.org/doi/10.1063/5.0095406"
}