Van der Waals electride: Toward intrinsic two-dimensional ferromagnetism of spin-polarized anionic electrons

Hyun Yong Song, Byung Il Yoo, Jin Ho Choi, Se Hwang Kang, Joonho Bang, Wei Li, Chandani N. Nandadasa, Dinesh Thapa, Duhee Yoon, Myung Joon Han, Kyu Hyoung Lee, Seong Gon Kim, Kimoon Lee, Sung Wng Kim

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Discoveries of two-dimensional (2D) magnetism originated from confined atomic layers in van der Waals (vdW) crystals provide an interesting arena for elucidating its fundamentals and enrich magneto-electric and quantum properties. However, a material that exhibits intrinsic 2D magnetism of interstitial electrons occupying layered space, as a root system of magnetic vdW crystals, remains obscure. In this work, 2D ferromagnetic vdW electride, [RECl]2+·2e (RE = Y and La) is reported with perfectly isolated ferromagnetic 2D blocks encompassing quasi-atomic electron layers. The ferromagnetism of the vdW electride with Curie temperature of 100 K originates from the spin-polarized quasi-atomic electrons with a substantial moment up to ∼0.91 Bohr magneton, which behave as magnetic elements in paramagnetic lattice framework. Invariable ferromagnetism at the monolayer limit strongly supports the 2D ferromagnetism of quasi-atomic electrons. These findings expand the variety of 2D magnetic crystals, providing a promising platform to study the emergent magnetism of low-dimensional electron phases.

Original languageEnglish
Article number100473
JournalMaterials Today Physics
Publication statusPublished - 2021 Sept

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government ( Ministry of Science, ICT & Future Planning ) (No. 2015M3D1A1070639 ) and Institute for Basic Science ( IBS-R011-D1 ).

Publisher Copyright:
© 2021 The Author(s)

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Energy (miscellaneous)
  • Physics and Astronomy (miscellaneous)


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