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Title: Magnetic properties of BaTiO{sub 3}/La{sub 0.7}Sr{sub 0.3}MnO{sub 3} thin films integrated on Si(100)

Two-phase multiferroic heterostructures composed of room-temperature ferroelectric BaTiO{sub 3} (BTO) and ferromagnetic La{sub 0.7}Sr{sub 0.3}MnO{sub 3} (LSMO) epitaxial thin films were grown on technologically important substrate Si (100). Bilayers of BTO/LSMO thin films display ferromagnetic Curie transition temperatures of ∼350 K, close to the bulk value, which are independent of BTO films thickness in the range of 25–100 nm. Discontinuous magnetization jumps associated with BTO structural transitions were suppressed in M(T) curves, probably due to substrate clamping effect. Interestingly, at cryogenic temperatures, the BTO/LSMO structure with BTO layer thickness of 100 nm shows almost 2-fold higher magnetic coercive field, 3-fold reduction in saturation magnetization, and improved squareness compared to the sample without BTO. We believe that the strong in-plane spin pinning of the ferromagnetic layer induced by BTO layer at BTO/LSMO interface could cause such changes in magnetic properties. This work forms a significant step forward in the integration of two-phase multiferroic heterostructures for CMOS applications.
Authors:
;  [1] ;  [2] ; ;  [3]
  1. Materials Science Division, Army Research Office, Research Triangle Park, North Carolina 27709 (United States)
  2. (United States)
  3. Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695 (United States)
Publication Date:
OSTI Identifier:
22402778
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DIAGRAMS; EPITAXY; FERROELECTRIC MATERIALS; INTERFACES; LAYERS; MAGNETIC PROPERTIES; MAGNETIZATION; SATURATION; SUBSTRATES; TEMPERATURE RANGE 0273-0400 K; THICKNESS; THIN FILMS; TITANATES; TRANSITION TEMPERATURE