Revealing room temperature ferromagnetism in exfoliated Fe5GeTe2 flakes with quantum magnetic imaging
Abstract
Van der Waals (vdW) material Fe5GeTe2, with its long-range ferromagnetic ordering near room temperature, has significant potential to become an enabling platform for implementing novel spintronic and quantum devices. To pave the way for applications, it is crucial to determine the magnetic properties when the thickness of Fe5GeTe2 reaches the few-layers regime. However, this is highly challenging due to the need for a characterization technique that is local, highly sensitive, artifact-free, and operational with minimal fabrication. Prior studies have indicated that Curie temperature TC can reach up to close to room temperature for exfoliated Fe5GeTe2 flakes, as measured via electrical transport; there is a need to validate these results with a measurement that reveals magnetism more directly. Here, we investigate the magnetic properties of exfoliated thin flakes of vdW magnet Fe5GeTe2 via quantum magnetic imaging technique based on nitrogen vacancy centers in diamond. Through imaging the stray fields, we confirm room-temperature magnetic order in Fe5GeTe2 thin flakes with thickness down to 7 units cell. The stray field patterns and their response to magnetizing fields with different polarities is consistent with previously reported perpendicular easy-axis anisotropy. Furthermore, we perform imaging at different temperatures and determine the Curie temperature of the flakesmore »
- Authors:
-
- Univ. of Delaware, Newark, DE (United States)
- Univ. of Delaware, Newark, DE (United States); Universidad Nacional de Colombia, Bogotá D.C. (Colombia)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); University of Delaware
- OSTI Identifier:
- 1872847
- Grant/Contract Number:
- AC05-00OR22725; 2011824; 1904076; 312181
- Resource Type:
- Accepted Manuscript
- Journal Name:
- 2D Materials
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 2; Journal ID: ISSN 2053-1583
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Fe5GeTe2; 2D magnet; quantum sensing
Citation Formats
Chen, Hang, Asif, Shahidul, Whalen, Matthew, Támara-Isaza, Jeyson, Luetke, Brennan, Wang, Yang, Wang, Xinhao, Ayako, Millicent, Lamsal, Saurabh, May, Andrew F., McGuire, Michael A., Chakraborty, Chitraleema, Xiao, John Q., and Ku, Mark H. Revealing room temperature ferromagnetism in exfoliated Fe5GeTe2 flakes with quantum magnetic imaging. United States: N. p., 2022.
Web. doi:10.1088/2053-1583/ac57a9.
Chen, Hang, Asif, Shahidul, Whalen, Matthew, Támara-Isaza, Jeyson, Luetke, Brennan, Wang, Yang, Wang, Xinhao, Ayako, Millicent, Lamsal, Saurabh, May, Andrew F., McGuire, Michael A., Chakraborty, Chitraleema, Xiao, John Q., & Ku, Mark H. Revealing room temperature ferromagnetism in exfoliated Fe5GeTe2 flakes with quantum magnetic imaging. United States. https://doi.org/10.1088/2053-1583/ac57a9
Chen, Hang, Asif, Shahidul, Whalen, Matthew, Támara-Isaza, Jeyson, Luetke, Brennan, Wang, Yang, Wang, Xinhao, Ayako, Millicent, Lamsal, Saurabh, May, Andrew F., McGuire, Michael A., Chakraborty, Chitraleema, Xiao, John Q., and Ku, Mark H. Mon .
"Revealing room temperature ferromagnetism in exfoliated Fe5GeTe2 flakes with quantum magnetic imaging". United States. https://doi.org/10.1088/2053-1583/ac57a9. https://www.osti.gov/servlets/purl/1872847.
@article{osti_1872847,
title = {Revealing room temperature ferromagnetism in exfoliated Fe5GeTe2 flakes with quantum magnetic imaging},
author = {Chen, Hang and Asif, Shahidul and Whalen, Matthew and Támara-Isaza, Jeyson and Luetke, Brennan and Wang, Yang and Wang, Xinhao and Ayako, Millicent and Lamsal, Saurabh and May, Andrew F. and McGuire, Michael A. and Chakraborty, Chitraleema and Xiao, John Q. and Ku, Mark H.},
abstractNote = {Van der Waals (vdW) material Fe5GeTe2, with its long-range ferromagnetic ordering near room temperature, has significant potential to become an enabling platform for implementing novel spintronic and quantum devices. To pave the way for applications, it is crucial to determine the magnetic properties when the thickness of Fe5GeTe2 reaches the few-layers regime. However, this is highly challenging due to the need for a characterization technique that is local, highly sensitive, artifact-free, and operational with minimal fabrication. Prior studies have indicated that Curie temperature TC can reach up to close to room temperature for exfoliated Fe5GeTe2 flakes, as measured via electrical transport; there is a need to validate these results with a measurement that reveals magnetism more directly. Here, we investigate the magnetic properties of exfoliated thin flakes of vdW magnet Fe5GeTe2 via quantum magnetic imaging technique based on nitrogen vacancy centers in diamond. Through imaging the stray fields, we confirm room-temperature magnetic order in Fe5GeTe2 thin flakes with thickness down to 7 units cell. The stray field patterns and their response to magnetizing fields with different polarities is consistent with previously reported perpendicular easy-axis anisotropy. Furthermore, we perform imaging at different temperatures and determine the Curie temperature of the flakes at ≈300 K. These results provide the basis for realizing a room-temperature monolayer ferromagnet with Fe5GeTe2. This work also demonstrates that the imaging technique enables rapid screening of multiple flakes simultaneously as well as time-resolved imaging for monitoring time-dependent magnetic behaviors, thereby paving the way towards high throughput characterization of potential two-dimensional (2D) magnets near room temperature and providing critical insights into the evolution of domain behaviors in 2D magnets due to degradation.},
doi = {10.1088/2053-1583/ac57a9},
journal = {2D Materials},
number = 2,
volume = 9,
place = {United States},
year = {Mon Mar 07 00:00:00 EST 2022},
month = {Mon Mar 07 00:00:00 EST 2022}
}
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