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Title: Interface Engineering of Domain Structures in BiFeO 3 Thin Films

A wealth of fascinating phenomena have been discovered at the BiFeO 3 domain walls, examples such as domain wall conductivity, photovoltaic effects, and magnetoelectric coupling. Thus, the ability to precisely control the domain structures and accurately study their switching behaviors is critical to realize the next generation of novel devices based on domain wall functionalities. In this work, the introduction of a dielectric layer leads to the tunability of the depolarization field both in the multilayers and superlattices, which provides a novel approach to control the domain patterns of BiFeO 3 films. Moreover, we are able to study the switching behavior of the first time obtained periodic 109° stripe domains with a thick bottom electrode. Besides, the precise controlling of pure 71° and 109° periodic stripe domain walls enable us to make a clear demonstration that the exchange bias in the ferromagnet/BiFeO 3 system originates from 109° domain walls. Lastly, our findings provide future directions to study the room temperature electric field control of exchange bias and open a new pathway to explore the room temperature multiferroic vortices in the BiFeO 3 system.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [2] ;  [2] ;  [2] ;  [2] ;  [4] ;  [5] ;  [4] ;  [6] ;  [7] ; ORCiD logo [3] ;  [2] ;  [8] ;  [2]
  1. South China Normal Univ., Guangzhou (China); Univ. of California, Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. South China Normal Univ., Guangzhou (China)
  5. Huazhong Univ. of Science and Technology of China, Wuhan (China)
  6. South China Univ. of Technology, Guangzhou (China)
  7. South Univ. of Science and Technology of China, Shenzhen (China)
  8. South China Normal Univ., Guangzhou (China); Nanjing Univ., Nanjing (China)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 17; Journal Issue: 1; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BiFeO3; depolarization field; domain wall; exchange bias; multiferroic; superlattices
OSTI Identifier:
1400211