Above-Room-Temperature Ferromagnetism in Thin van der Waals Flakes of Cobalt-Substituted Fe5GeTe2

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.

doi:10.1021/acsami.2c18028

Title: Above-Room-Temperature Ferromagnetism in Thin van der Waals Flakes of Cobalt-Substituted Fe₅GeTe₂

Journal Article · Thu Jan 05 00:00:00 EST 2023 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.2c18028· OSTI ID:1965213

^[1]; Asif, Shahidul ^[1]; Dolui, Kapildeb ^[2];

^[1]; Támara-Isaza, Jeyson ^[3]; Goli, V. Prasad ^[1]; Whalen, Matthew ^[1]; Wang, Xinhao ^[1];

^[4]; Zhang, Huiqin ^[5];

^[4];

^[5];

^[1]; Chakraborty, Chitraleema ^[1];

^[6];

^[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

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 T_c 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 T_c of ~270 K in CFGT monolayers. Pathways toward further enhancing monolayer T_c are discussed. These results support CFGT as a promising platform for realizing high-quality room-temperature 2D magnet devices.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; DMR-2011824; DMR-1720530; DMR-2005108

OSTI ID:: 1965213

Journal Information:: ACS Applied Materials and Interfaces, Vol. 15, Issue 2; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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quantum magnetic imaging

Title: Above-Room-Temperature Ferromagnetism in Thin van der Waals Flakes of Cobalt-Substituted Fe5GeTe2

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Title: Above-Room-Temperature Ferromagnetism in Thin van der Waals Flakes of Cobalt-Substituted Fe₅GeTe₂