Article Large magnetodielectric coupling in layered perovskite Eu 2 Ti O 4

Yang Zhang ; Yudai Hasegawa ; Shingo Kitano ; Lihong Liu SAMURAI ORCID (National Institute for Materials Science) ; Tohru S. Suzuki SAMURAI ORCID (National Institute for Materials Science) ; Wei Yi ORCID (National Institute for Materials Science) ; Hirofumi Akamatsu ; Koji Fujita

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Yang Zhang, Yudai Hasegawa, Shingo Kitano, Lihong Liu, Tohru S. Suzuki, Wei Yi, Hirofumi Akamatsu, Koji Fujita. Large magnetodielectric coupling in layered perovskite Eu 2 Ti O 4 . Physical Review B. 2025, 111 (22), L220401. https://doi.org/10.1103/physrevb.111.l220401

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(abstract)

Perovskite-type EuTiO3, which is quantum paraelectric and ๐บ-type antiferromagnetic (AFM) in the bulk form, has attracted great attention due to its strong spin-lattice coupling and strain-induced multiferroic in thin film form. In this study, significant magnetodielectric (MD) coupling is demonstrated in K2NiF4-type ferromagnetic (FM) layered perovskite Eu2TiO4. Remarkably, an applied magnetic field induces a substantial increase in permittivity at ๐‘‡C, which is three times larger than that observed in bulk EuTiO3. Our experimental and first-principles studies reveal that the insertion of EuO layers in Eu2TiO4 enhances the Eu-๐‘“/Ti-๐‘‘ orbitals hybridization through pseudostrain in the EuTiO3 layers, as well as modifies the magnetic exchange paths that favor ferromagnetism over antiferromagnetism. Our findings demonstrate the potential of layered structure to control MD coupling, paving the way for new strategies in designing MD materials.

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Keyword: Magnetodielectric coupling, Superexchange interaction, Hybridization, Pseudo-strain

Date published: 2025-06-02

Publisher: American Physical Society (APS)

Journal:

  • Physical Review B (ISSN: 1550235X) vol. 111 issue. 22 L220401

Funding:

  • JFE 21st Century Foundation
  • Japan Synchrotron Radiation Research Institute 2023A1498
  • Japan Synchrotron Radiation Research Institute 2023B1654
  • Japan Synchrotron Radiation Research Institute 2024A1510
  • Research Institute for Information Technology, Kyushu University
  • Japan Society for the Promotion of Science JP22K04686
  • Japan Society for the Promotion of Science JP21H04619
  • Japan Society for the Promotion of Science JP23K23043
  • Japan Society for the Promotion of Science JP24K21688
  • Japan Society for the Promotion of Science JP25K08265
  • Japan Society for the Promotion of Science JP25K01500
  • Izumi Science and Technology Foundation
  • Sumitomo Electric Industries

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6018

First published URL: https://doi.org/10.1103/physrevb.111.l220401

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Updated at: 2025-12-15 15:23:54 +0900

Published on MDR: 2025-12-19 14:11:40 +0900

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