Room temperature ferromagnetism in organic molecule-intercalated Fe2.7GeTe2

Published

September 17, 2022

Author(s)

Hector Iturriaga, Luis M. Martinez, Thuc Mai, Mathias Augustin, Angela Hight Walker, Mohamed Sanad, Sreeprasad Sreenivasan, Yu Liu, Elton Santos, Cedomir Petrovic, SRINIVASA RAO SINGAMANENI

Abstract

Among several well-known transition metal-based compounds, van der Waals (vdW) Fe2.7GeTe2 (FGT) is a strong candidate for use in 2D magnetic devices due to its strong perpendicular magnetic anisotropy, relatively high Curie temperature (TC 154 K), and extremely 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 favorably altering it via external driving-forces such as pressure, irradiation, and doping. Here we present experimental evidence of a novel room-temperature ferromagnetic phase induced by the electrochemical intercalation of tetrabutylammonium cations (TBA+) into FGT bulk crystals. The temperature-dependent Raman measurements in combination with vdW-corrected ab initio calculations suggest that the charge transfer (electron doping) upon the intercalation could lead to the observation of room temperature ferromagnetism. This work demonstrates that molecular intercalation is a viable route in realizing high temperature vdW magnets in an inexpensive and reliable manner.

Citation

ACS Nano

Pub Type

Journals

Keywords

2D, ferromagnetism, magnetometry, Raman, intercalation

Citation

Iturriaga, H. , Martinez, L. , Mai, T. , Augustin, M. , Hight Walker, A. , Sanad, M. , Sreenivasan, S. , Liu, Y. , Santos, E. , Petrovic, C. and SINGAMANENI, S. (2022), Room temperature ferromagnetism in organic molecule-intercalated Fe2.7GeTe2, ACS Nano (Accessed February 18, 2026)