Magnetic properties of intercalated quasi-2D Fe3-xGeTe2 van der Waals magnet

Hector Iturriaga, Luis M. Martinez, Thuc T. Mai, Adam J. Biacchi, Mathias Augustin, Angela R. Hight Walker, Mohamed Fathi Sanad, Sreeprasad T. Sreenivasan, Yu Liu, Elton J.G. Santos*, Cedomir Petrovic, Srinivasa R. Singamaneni*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Among several well-known transition metal-based compounds, cleavable van der Waals (vdW) Fe3-xGeTe2 (FGT) magnet is a strong candidate for use in two-dimensional (2D) magnetic devices due to its strong perpendicular magnetic anisotropy, sizeable Curie temperature (TC ~154 K), and versatile magnetic character that is retained in the low-dimensional limit. While the TC remains far too low for practical applications, there has been a successful push toward improving it via external driving forces such as pressure, irradiation, and doping. Here we present experimental evidence of a room temperature (RT) ferromagnetic phase induced by the electrochemical intercalation of common tetrabutylammonium cations (TBA+) into quasi-2D FGT. We obtained Curie temperatures as high as 350 K with chemical and physical stability of the intercalated compound. The temperature-dependent Raman measurements, in combination with vdW-corrected ab initio calculations, suggest that charge transfer (electron doping) upon intercalation could lead to the observation of RT ferromagnetism. This work demonstrates that molecular intercalation is a viable route in realizing high-temperature vdW magnets in an inexpensive and reliable manner, and has the potential to be extended to bilayer and few-layer vdW magnets.
Original languageEnglish
Article number56
Pages (from-to)1-8
Number of pages8
Journalnpj 2D Materials and Applications
Volume7
Issue number1
DOIs
Publication statusPublished - 21 Aug 2023

Keywords / Materials (for Non-textual outputs)

  • Ferromagnetism
  • Light
  • Scattering

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