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Title: 180° Ferroelectric Stripe Nanodomains in BiFeO3 Thin Films

Journal Article · · Nano Letters
 [1];  [2];  [3];  [1];  [1];  [1];  [4];  [5];  [6];  [7]
  1. Univ. of California, Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Hubei University, Wuhan (China)
  4. University of Illinois, Urbana−Champaign, Urbana, IL (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. University of Illinois, Urbana−Champaign, Urbana, IL (United States); International Institute for Carbon Neutral Research, Nishi-ku, Fukuoka (Japan)
  7. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); International Institute for Carbon Neutral Research, Nishi-ku, Fukuoka (Japan)

We present that there is growing evidence that domain walls in ferroics can possess emergent properties that are absent in the bulk. For example, 180° ferroelectric domain walls in the ferroelectric-antiferromagnetic BiFeO3 are particularly interesting because they have been predicted to possess a range of intriguing behaviors, including electronic conduction and enhanced magnetization. To date, however, ordered arrays of such domain structures have not been reported. Here, we report the observation of 180° stripe nanodomains in (110)-oriented BiFeO3 thin films grown on orthorhombic GdScO3(010)O substrates and their impact on exchange coupling to metallic ferromagnets. Nanoscale ferroelectric 180° stripe domains with { $$ 11\bar{2} $$} domain walls were observed in films <32 nm thick. With increasing film thickness, we observed a domain structure crossover from the depolarization field-driven 180° stripe nanodomains to 71° ferroelastic domains determined by the elastic energy. These 180° domain walls (which are typically cylindrical or meandering in nature due to a lack of strong anisotropy associated with the energy of such walls) are found to be highly ordered. Additional studies of Co0.9Fe0.1/BiFeO3 heterostructures reveal exchange bias and exchange enhancement in heterostructures based on BiFeO3 with 180° domain walls and an absence of exchange bias in heterostructures based on BiFeO3 with 71° domain walls; suggesting that the 180° domain walls could be the possible source for pinned uncompensated spins that give rise to exchange bias. This is further confirmed by X-ray circular magnetic dichroism studies, which demonstrate that films with predominantly 180° domain walls have larger magnetization than those with primarily 71° domain walls. In conclusion, our results could be useful to extract the structure of domain walls and to explore domain wall functionalities in BiFeO3.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1530208
Journal Information:
Nano Letters, Vol. 15, Issue 10; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 54 works
Citation information provided by
Web of Science

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Cited By (14)

Progress in BiFeO 3 -based heterostructures: materials, properties and applications journal January 2020
Thin-film ferroelectric materials and their applications journal November 2016
Complex strain evolution of polar and magnetic order in multiferroic BiFeO3 thin films journal September 2018
Thermooptical evidence of carrier-stabilized ferroelectricity in ultrathin electrodeless films journal May 2018
Enhanced Structural, Optical, and Multiferroic Properties of Rod-Like Bismuth Iron Oxide Nanoceramics by Dopant Lanthanum journal November 2019
BiFeO 3 nanorings synthesized via AAO template-assisted pulsed laser deposition and ion beam etching journal January 2017
Temperature dependence of exchange biased multiferroic BiFeO 3 /Ni 81 Fe 19 polycrystalline bilayer journal March 2018
Mixture domain states in PbTiO 3 film with potentials for functional application journal June 2019
Charge-Transfer-Induced Interfacial Exchange Coupling at the Co / Bi Fe O 3 Interface journal October 2019
Acidic aqueous solution switching of magnetism in BiFeO 3 /La 1 − x Sr x MnO 3 heterostructures journal August 2019
Self-assembly and properties of domain walls in BiFeO 3 layers grown via molecular-beam epitaxy journal July 2019
Photocatalytic activity and magnetic enhancements by addition of lanthanum into the BiFeO3 structure and the effect of synthesis method journal May 2018
Néel-like domain walls in ferroelectric Pb(Zr,Ti)O3 single crystals journal August 2016
Long-range Stripe Nanodomains in Epitaxial (110) BiFeO3 Thin Films on (100) NdGaO3 Substrate journal July 2017