Above-Room-Temperature Ferromagnetism in Thin van der Waals Flakes of Cobalt-Substituted Fe5GeTe2
Abstract
Two-dimensional (2D) magnetic van der Waals materials provide a powerful platform for studying the fundamental physics of low-dimensional magnetism, engineering novel magnetic phases, and enabling thin and highly tunable spintronic devices. To realize high-quality and practical devices for such applications, there is a critical need for robust 2D magnets with ordering temperatures above room temperature that can be created via exfoliation. Here, in this paper, the study of exfoliated flakes of cobalt-substituted Fe5GeTe2 (CFGT) exhibiting magnetism above room temperature is reported. Via quantum magnetic imaging with nitrogen-vacancy centers in diamond, ferromagnetism at room temperature was observed in CFGT flakes as thin as 16 nm corresponding to 16 layers. This result expands the portfolio of thin room-temperature 2D magnet flakes exfoliated from robust single crystals that reach a thickness regime relevant to practical spintronic applications. The Curie temperature Tc of CFGT ranges from 310 K in the thinnest flake studied to 328 K in the bulk. To investigate the prospect of high-temperature monolayer ferromagnetism, Monte Carlo calculations were performed, which predicted a high value of Tc of ~270 K in CFGT monolayers. Pathways toward further enhancing monolayer Tc are discussed. These results support CFGT as a promising platform for realizing high-qualitymore »
- Authors:
-
[1];
[1];
[4];
[4];
[5];
[1];
[6];
[6];
[1];
[1];
[1]
- Univ. of Delaware, Newark, DE (United States)
- Lomare Technologies Ltd. (United Kingdom)
- Univ. of Delaware, Newark, DE (United States); Universidad Nacional de Colombia (Colombia)
- Georgetown Univ., Washington, DC (United States)
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (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)
- OSTI Identifier:
- 1965213
- Grant/Contract Number:
- AC05-00OR22725; DMR-2011824; DMR-1720530; DMR-2005108
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Applied Materials and Interfaces
- Additional Journal Information:
- Journal Volume: 15; Journal Issue: 2; Journal ID: ISSN 1944-8244
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; crystals; layers; magnetic properties; materials; monolayers; 2D magnetism; nitrogen-vacancy centers; co-substituted Fe5GeTe2; van der Waals magnets; quantum magnetic imaging
Citation Formats
Chen, Hang, Asif, Shahidul, Dolui, Kapildeb, Wang, Yang, Támara-Isaza, Jeyson, Goli, V. Prasad, Whalen, Matthew, Wang, Xinhao, Chen, Zhijie, Zhang, Huiqin, Liu, Kai, Jariwala, Deep, Jungfleisch, M. Benjamin, Chakraborty, Chitraleema, May, Andrew F., McGuire, Michael A., Nikolic, Branislav K., Xiao, John Q., and Ku, Mark H. Above-Room-Temperature Ferromagnetism in Thin van der Waals Flakes of Cobalt-Substituted Fe5GeTe2. United States: N. p., 2023.
Web. doi:10.1021/acsami.2c18028.
Chen, Hang, Asif, Shahidul, Dolui, Kapildeb, Wang, Yang, Támara-Isaza, Jeyson, Goli, V. Prasad, Whalen, Matthew, Wang, Xinhao, Chen, Zhijie, Zhang, Huiqin, Liu, Kai, Jariwala, Deep, Jungfleisch, M. Benjamin, Chakraborty, Chitraleema, May, Andrew F., McGuire, Michael A., Nikolic, Branislav K., Xiao, John Q., & Ku, Mark H. Above-Room-Temperature Ferromagnetism in Thin van der Waals Flakes of Cobalt-Substituted Fe5GeTe2. United States. https://doi.org/10.1021/acsami.2c18028
Chen, Hang, Asif, Shahidul, Dolui, Kapildeb, Wang, Yang, Támara-Isaza, Jeyson, Goli, V. Prasad, Whalen, Matthew, Wang, Xinhao, Chen, Zhijie, Zhang, Huiqin, Liu, Kai, Jariwala, Deep, Jungfleisch, M. Benjamin, Chakraborty, Chitraleema, May, Andrew F., McGuire, Michael A., Nikolic, Branislav K., Xiao, John Q., and Ku, Mark H. Thu .
"Above-Room-Temperature Ferromagnetism in Thin van der Waals Flakes of Cobalt-Substituted Fe5GeTe2". United States. https://doi.org/10.1021/acsami.2c18028. https://www.osti.gov/servlets/purl/1965213.
@article{osti_1965213,
title = {Above-Room-Temperature Ferromagnetism in Thin van der Waals Flakes of Cobalt-Substituted Fe5GeTe2},
author = {Chen, Hang and Asif, Shahidul and Dolui, Kapildeb and Wang, Yang and Támara-Isaza, Jeyson and Goli, V. Prasad and Whalen, Matthew and Wang, Xinhao and Chen, Zhijie and Zhang, Huiqin and Liu, Kai and Jariwala, Deep and Jungfleisch, M. Benjamin and Chakraborty, Chitraleema and May, Andrew F. and McGuire, Michael A. and Nikolic, Branislav K. and Xiao, John Q. and Ku, Mark H.},
abstractNote = {Two-dimensional (2D) magnetic van der Waals materials provide a powerful platform for studying the fundamental physics of low-dimensional magnetism, engineering novel magnetic phases, and enabling thin and highly tunable spintronic devices. To realize high-quality and practical devices for such applications, there is a critical need for robust 2D magnets with ordering temperatures above room temperature that can be created via exfoliation. Here, in this paper, the study of exfoliated flakes of cobalt-substituted Fe5GeTe2 (CFGT) exhibiting magnetism above room temperature is reported. Via quantum magnetic imaging with nitrogen-vacancy centers in diamond, ferromagnetism at room temperature was observed in CFGT flakes as thin as 16 nm corresponding to 16 layers. This result expands the portfolio of thin room-temperature 2D magnet flakes exfoliated from robust single crystals that reach a thickness regime relevant to practical spintronic applications. The Curie temperature Tc of CFGT ranges from 310 K in the thinnest flake studied to 328 K in the bulk. To investigate the prospect of high-temperature monolayer ferromagnetism, Monte Carlo calculations were performed, which predicted a high value of Tc of ~270 K in CFGT monolayers. Pathways toward further enhancing monolayer Tc are discussed. These results support CFGT as a promising platform for realizing high-quality room-temperature 2D magnet devices.},
doi = {10.1021/acsami.2c18028},
journal = {ACS Applied Materials and Interfaces},
number = 2,
volume = 15,
place = {United States},
year = {Thu Jan 05 00:00:00 EST 2023},
month = {Thu Jan 05 00:00:00 EST 2023}
}
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