Room temperature ferromagnetism in intercalated Fe3-xGeTe2 van der Waals magnet

Among several well-known transition metal-based compounds, the 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 chara...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2022-09
Main Authors: Iturriaga, Hector, Martinez, Luis M, Mai, Thuc T, Augustin, Mathias, Hight Walker, Angela R, Sanad, M F, Sreenivasan, Sreeprasad T, Liu, Y, Santos, Elton J G, Petrovic, C, Singamaneni, Srinivasa R
Format: Article
Language:English
Subjects:
Charge transfer
Curie temperature
Doping
External pressure
Ferromagnetic phases
Ferromagnetism
High temperature
Intercalation
Magnetic anisotropy
Magnetic devices
Magnetism
Magnets
Room temperature
Temperature
Temperature dependence
Transition metals
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Among several well-known transition metal-based compounds, the 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 novel room-temperature (RT) ferromagnetic phase induced by the electrochemical intercalation of common tetrabutylammonium cations (TBA+) into FGT bulk crystals. 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.
ISSN:2331-8422