Molinari, Alan ; Gorji, Saleh ; Michalička, Jan ; Kübel, Christian ; Hahn, Horst ; Kruk, Robert (2022)
Tailoring interface epitaxy and magnetism in La1−xSrxMnO3/SrTiO3 heterostructures via temperature-driven defect engineering.
In: Journal of Applied Physics, 132 (10)
doi: 10.1063/5.0095406
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
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).
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2022 |
| Autor(en): | Molinari, Alan ; Gorji, Saleh ; Michalička, Jan ; Kübel, Christian ; Hahn, Horst ; Kruk, Robert |
| Art des Eintrags: | Bibliographie |
| Titel: | Tailoring interface epitaxy and magnetism in La1−xSrxMnO3/SrTiO3 heterostructures via temperature-driven defect engineering |
| Sprache: | Englisch |
| Publikationsjahr: | 14 September 2022 |
| Verlag: | AIP Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Applied Physics |
| Jahrgang/Volume einer Zeitschrift: | 132 |
| (Heft-)Nummer: | 10 |
| DOI: | 10.1063/5.0095406 |
| Kurzbeschreibung (Abstract): | 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). |
| ID-Nummer: | Artikel-ID: 105304 |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > In-Situ Elektronenmikroskopie 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Gemeinschaftslabor Nanomaterialien |
| Hinterlegungsdatum: | 12 Jun 2024 08:49 |
| Letzte Änderung: | 12 Jun 2024 12:35 |
| PPN: | 519054555 |
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