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Deterministic and robust room-temperature exchange coupling in monodomain multiferroic BiFeO3 heterostructures

Journal Article · · Nature Communications
 [1];  [2];  [3];  [1];  [1];  [4];  [5];  [6];  [1];  [1];  [1];  [7];  [7];  [1];  [1];  [8];  [9];  [3];  [1];  [1]
  1. Univ. of Wisconsin, Madison, WI (United States)
  2. Univ. of Wisconsin, Madison, WI (United States); TASC National Lab., Trieste (Italy); Temple Univ., Philadelphia, PA (United States)
  3. Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.
  4. Univ. of Oxford, Oxford (United Kingdom); Rutherford Appleton Lab., Didcot (United Kingdom)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Luxembourg Institute of Science and Technology, Alzette (Luxembourg)
  7. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  8. Argonne National Lab. (ANL), Argonne, IL (United States); Northern Illinois Univ., DeKalb, IL (United States)
  9. Univ. of Oxford, Oxford (United Kingdom)
Exploiting multiferroic BiFeO3 thin films in spintronic devices requires deterministic and robust control of both internal magnetoelectric coupling in BiFeO3, as well as exchange coupling of its antiferromagnetic order to a ferromagnetic overlayer. Previous reports utilized approaches based on multi-step ferroelectric switching with multiple ferroelectric domains. Because domain walls can be responsible for fatigue, contain localized charges intrinsically or via defects, and present problems for device reproducibility and scaling, an alternative approach using a monodomain magnetoelectric state with single-step switching is desirable. Here we demonstrate room temperature, deterministic and robust, exchange coupling between monodomain BiFeO3 films and Co overlayer that is intrinsic (i.e., not dependent on domain walls). Direct coupling between BiFeO3 antiferromagnetic order and Co magnetization is observed, with ~90° in-plane Co moment rotation upon single-step switching that is reproducible for hundreds of cycles. Finally, this has important consequences for practical, low power non-volatile magnetoelectric devices utilizing BiFeO3.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
Army Research Office; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1466373
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 8; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Spin-coupling-induced Improper Polarizations and Latent Magnetization in Multiferroic BiFeO3 journal January 2018
Effect of CoFe2O4 weight fraction on multiferroic and magnetoelectric properties of (1 − x)Ba0.85Ca0.15Zr0.1Ti0.9O3  −  xCoFe2O4 particulate composites journal March 2019
Shear-strain-mediated magnetoelectric effects revealed by imaging journal May 2019
Opportunities and challenges for magnetoelectric devices journal August 2019
A magnetic phase diagram for nanoscale epitaxial BiFeO 3 films journal December 2019
Strain Engineering a Multiferroic Monodomain in Thin-Film Bi Fe O 3 journal February 2019
Influence of flexoelectricity on the spin cycloid in (110)-oriented BiFe O 3 films journal October 2019
A Short Review on Verwey Transition in Nanostructured Fe 3 O 4 Materials journal March 2019
Shear-strain-mediated magnetoelectric effects revealed by imaging. journalarticle January 2019

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