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How does thickness affect magnetic coupling in Ti-based MXenes.

Néstor García-Romeral1, Ángel Morales-García1, Francesc Viñes1

  • 1Departament de Ciència de Materials i Química Física & Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain. francesc.illas@ub.edu.

Physical Chemistry Chemical Physics : PCCP
|June 26, 2023
PubMed
Summary
This summary is machine-generated.

Titanium carbide (TiC) MXenes exhibit a magnetic ground state, with spin density localized on surface titanium atoms. Calculations reveal an antiferromagnetic conducting state, proposing a model of diamagnetic inner and paramagnetic surface Ti ions.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • MXenes, a class of 2D materials, have garnered significant attention for their unique properties.
  • The magnetic behavior of early transition metal carbides (MXenes) is crucial for potential spintronic applications.
  • Understanding the electronic and magnetic structure of Ti-based MXenes is essential for materials design.

Purpose of the Study:

  • To investigate the magnetic ground state of Ti2C, Ti3C2, and Ti4C3 MXenes.
  • To determine the spin ordering and electronic properties using various density functional theory (DFT) functionals.
  • To propose a physically meaningful spin model and extract magnetic coupling constants.

Main Methods:

  • Periodic calculations using density functional theory (DFT).
  • Application of generalized gradient approximation (GGA) PBE, hybrid PBE0 and HSE06 functionals, and PBE+U.
  • Analysis of spin densities, spin ordering, and extraction of magnetic coupling constants from a Heisenberg spin model.

Main Results:

  • All employed DFT functionals consistently predict a magnetic ground state for Ti2C, Ti3C2, and Ti4C3 MXenes.
  • Spin densities are primarily localized on the surface Ti atoms.
  • An antiferromagnetic conducting ground state is predicted, with ferromagnetic surface layers coupled antiferromagnetically.
  • A spin model with diamagnetic inner Ti2+ and paramagnetic surface Ti+ ions is proposed.
  • Nearest-neighbor intralayer coupling is ferromagnetic and dominant, with significant antiferromagnetic interlayer interactions.
  • MXene thickness influences the ferromagnetic interaction, increasing with width.

Conclusions:

  • Ti-based MXenes possess an intrinsic magnetic nature, crucial for their electronic properties.
  • The proposed spin model provides a framework for understanding the magnetic interactions in these materials.
  • The interplay of intralayer and interlayer magnetic couplings dictates the overall magnetic behavior.
  • DFT calculations offer reliable insights into the magnetic properties of MXenes, guiding future material development.