Defect-Induced Hedgehog Polarization States in Multiferroics
- Univ. of California, Irvine, CA (United States); Univ. of Michigan, Ann Arbor, MI (United States)
- Pennsylvania State Univ., University Park, PA (United States)
- Univ. of Michigan, Ann Arbor, MI (United States)
- Cornell Univ., Ithaca, NY (United States)
- Cornell Univ., Ithaca, NY (United States); Kavli Inst. at Cornell for Nanoscale Science
- Univ. of California, Irvine, CA (United States)
Continuous developments in nanotechnology require new approaches to materials synthesis that can produce novel functional structures. Here, we show that nanoscale defects, such as nonstoichiometric nanoregions (NSNRs), can act as nano-building blocks for creating complex electrical polarization structures in the prototypical multiferroic BiFeO3. An array of charged NSNRs are produced in BiFeO3 thin films by tuning the substrate temperature during film growth. Atomic-scale scanning transmission electron microscopy imaging reveals exotic polarization rotation patterns around these NSNRs. These polarization patterns resemble hedgehog or vortex topologies and can cause local changes in lattice symmetries leading to mixed-phase structures resembling the morphotropic phase boundary with high piezoelectricity. Phase-field simulations indicate that the observed polarization configurations are mainly induced by charged states at the NSNRs. Engineering defects thus may provide a new route for developing ferroelectric-or multiferroic-based nanodevices.
- Research Organization:
- Pennsylvania State Univ., University Park, PA (United States); Univ. of California, Irvine, CA (United States); Univ. of California, Oakland, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)
- Grant/Contract Number:
- FG02-07ER46417; SC0014430; AC02-05CH11231; ECCS-1542081; EEC-1160504; DMR0723032; OCI0821527; AC0205CH11231; FG0207ER46417
- OSTI ID:
- 1600477
- Alternate ID(s):
- OSTI ID: 1429959
- Journal Information:
- Physical Review Letters, Vol. 120, Issue 13; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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