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Title: Ferromagnetism and ferroelectricity in epitaxial BiMnO{sub 3} ultra-thin films

We studied the ferroelectric and ferromagnetic properties of compressive strained and unstrained BiMnO{sub 3} thin films grown by rf-magnetron sputtering. BiMnO{sub 3} samples exhibit a two-dimensional cube-on-cube growth mode and a pseudo-cubic structure up to a thickness of 15 nm and of 25 nm when deposited on (001) SrTiO{sub 3} and (110) DyScO{sub 3}, respectively. Above these thicknesses, we observe a switching to a three-dimensional island growth mode and a simultaneous structural change to a (00l) oriented monoclinic unit cell. While ferromagnetism is observed below a T{sub C} ≈ 100 K for all samples, signatures of room temperature ferroelectricity were found only in the pseudo-cubic ultra-thin films, indicating a correlation between electronic and structural orders.
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [5]
  1. CNR-SPIN, Complesso Monte S. Angelo, Via Cintia, 80126 Napoli (Italy)
  2. Dipartimento di Fisica, Università “Federico II” di Napoli, Complesso Monte S. Angelo, Via Cintia, 80126 Napoli (Italy)
  3. (Germany)
  4. (Italy)
  5. Département de Physique de la Matière Condensée, Université de Genève, 24 Quai Ernest Ansermet, 1211 Geneva 4 (Switzerland)
Publication Date:
OSTI Identifier:
22218214
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 6; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DEPOSITS; EPITAXY; FERROELECTRIC MATERIALS; FERROMAGNETIC MATERIALS; FERROMAGNETISM; LAYERS; MAGNETRONS; MONOCLINIC LATTICES; SPUTTERING; STRAINS; STRONTIUM TITANATES; TEMPERATURE RANGE 0273-0400 K; THICKNESS; THIN FILMS