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Achieving High-Temperature Multiferroism by Atomic Architecture.

Yi Cao1,2, Yun-Long Tang1, Yin-Lian Zhu1,3

  • 1Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, Shenyang 110016, China.

ACS Applied Materials & Interfaces
|January 9, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed new single-phase multiferroic materials combining high-temperature magnetism and switchable ferroelectricity. This breakthrough offers a pathway for advanced multifunctional electronics and spintronic devices.

Keywords:
atomic occupancychemical engineeringdilute magnetic oxideshigh-temperature multiferroicsmagnetoelectric coupling

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Multiferroic materials, exhibiting coupled ferroelectric and magnetic orders, are key for next-generation electronics.
  • Challenges in finding single-phase multiferroics include conflicting requirements for ferroelectricity and magnetism, low operating temperatures, and weak order coupling.

Purpose of the Study:

  • To report a new family of single-phase multiferroic materials with coupled high-temperature magnetism and voltage-switchable ferroelectricity.
  • To demonstrate a fabrication strategy for thermally stable multiferroic materials.

Main Methods:

  • Pulsed laser deposition of single-crystalline thin films.
  • Fabrication of Pb(Ti1-xFex)O3 (PFT(x)) with Fe cations at B-site occupancy.
  • Atomically resolved chemical analysis to confirm structure and ordering.

Main Results:

  • Developed PFT(x) (x ≤ 0.10) exhibiting switchable ferroelectricity and room-temperature magnetic interaction (coercive field ~300 Oe).
  • Observed magnetic order persisting above 500 K, significantly higher than existing multiferroic candidates.
  • Demonstrated long-range spin ordering within a displacive ferroelectric PbTiO3 lattice.

Conclusions:

  • A novel strategy of integrating spin-ordered sublattices into ferroelectrics via atomic occupancy engineering was successful.
  • The developed PFT(x) materials offer a promising pathway for highly thermally stable multiferroic and spintronic applications.
  • This work overcomes limitations of previous multiferroics, paving the way for practical multifunctional devices.