Magnetism and spin dynamics in room-temperature van der Waals magnet Fe5GeTe2
Abstract
Two-dimensional van der Waals (vdWs) materials have gathered a lot of attention recently. However, the majority of these materials have Curie temperatures that are well below room temperature, making it challenging to incorporate them into device applications. In this work, we synthesized a room-temperature vdW magnetic crystal Fe5GeTe2 with a Curie temperature Tc = 332 K, and studied its magnetic properties by vibrating sample magnetometry (VSM) and broadband ferromagnetic resonance (FMR) spectroscopy. The experiments were performed with external magnetic fields applied along the c-axis (H∥c) and the ab-plane (H∥ab), with temperatures ranging from 300 to 10 K. We have found a sizable Landé g-factor difference between the H∥c and H∥ab cases. In both cases, the Landé g-factor values deviated from g = 2. This indicates contribution of orbital angular momentum to the magnetic moment. The FMR measurements reveal that Fe5GeTe2 has a damping constant comparable to Permalloy. With reducing temperature, the linewidth was broadened. Together with the VSM data, our measurements indicate that Fe5GeTe2 transitions from ferromagnetic to ferrimagnetic at lower temperatures. Our experiments highlight key information regarding the magnetic state and spin scattering processes in Fe5GeTe2, which promote the understanding of magnetism in Fe5GeTe2, leading to implementations of Fe5GeTe2more »
- Authors:
-
[1];
[1];
[3];
[1]
- Auburn Univ., AL (United States)
- Univ. of Alabama, Tuscaloosa, AL (United States)
- Florida State Univ., Tallahassee, FL (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Case Western Reserve Univ., Cleveland, OH (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1871122
- Grant/Contract Number:
- AC05-00OR22725; DMR-2129879335; SC0002613; 1939999; 1452670
- Resource Type:
- Accepted Manuscript
- Journal Name:
- 2D Materials
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 4; Journal ID: ISSN 2053-1583
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; spin dynamics; room-temperature ferromagnetism; van der Waals magnet; Fe5GeTe2
Citation Formats
Alahmed, Laith, Nepal, Bhuwan, Macy, Juan, Zheng, Wenkai, Casas, Brian, Sapkota, Arjun, Jones, Nicholas, Mazza, Alessandro R., Brahlek, Matthew, Jin, Wencan, Mahjouri-Samani, Masoud, Zhang, Steven S.-L., Mewes, Claudia, Balicas, Luis, Mewes, Tim, and Li, Peng. Magnetism and spin dynamics in room-temperature van der Waals magnet Fe5GeTe2. United States: N. p., 2021.
Web. doi:10.1088/2053-1583/ac2028.
Alahmed, Laith, Nepal, Bhuwan, Macy, Juan, Zheng, Wenkai, Casas, Brian, Sapkota, Arjun, Jones, Nicholas, Mazza, Alessandro R., Brahlek, Matthew, Jin, Wencan, Mahjouri-Samani, Masoud, Zhang, Steven S.-L., Mewes, Claudia, Balicas, Luis, Mewes, Tim, & Li, Peng. Magnetism and spin dynamics in room-temperature van der Waals magnet Fe5GeTe2. United States. https://doi.org/10.1088/2053-1583/ac2028
Alahmed, Laith, Nepal, Bhuwan, Macy, Juan, Zheng, Wenkai, Casas, Brian, Sapkota, Arjun, Jones, Nicholas, Mazza, Alessandro R., Brahlek, Matthew, Jin, Wencan, Mahjouri-Samani, Masoud, Zhang, Steven S.-L., Mewes, Claudia, Balicas, Luis, Mewes, Tim, and Li, Peng. Mon .
"Magnetism and spin dynamics in room-temperature van der Waals magnet Fe5GeTe2". United States. https://doi.org/10.1088/2053-1583/ac2028. https://www.osti.gov/servlets/purl/1871122.
@article{osti_1871122,
title = {Magnetism and spin dynamics in room-temperature van der Waals magnet Fe5GeTe2},
author = {Alahmed, Laith and Nepal, Bhuwan and Macy, Juan and Zheng, Wenkai and Casas, Brian and Sapkota, Arjun and Jones, Nicholas and Mazza, Alessandro R. and Brahlek, Matthew and Jin, Wencan and Mahjouri-Samani, Masoud and Zhang, Steven S.-L. and Mewes, Claudia and Balicas, Luis and Mewes, Tim and Li, Peng},
abstractNote = {Two-dimensional van der Waals (vdWs) materials have gathered a lot of attention recently. However, the majority of these materials have Curie temperatures that are well below room temperature, making it challenging to incorporate them into device applications. In this work, we synthesized a room-temperature vdW magnetic crystal Fe5GeTe2 with a Curie temperature Tc = 332 K, and studied its magnetic properties by vibrating sample magnetometry (VSM) and broadband ferromagnetic resonance (FMR) spectroscopy. The experiments were performed with external magnetic fields applied along the c-axis (H∥c) and the ab-plane (H∥ab), with temperatures ranging from 300 to 10 K. We have found a sizable Landé g-factor difference between the H∥c and H∥ab cases. In both cases, the Landé g-factor values deviated from g = 2. This indicates contribution of orbital angular momentum to the magnetic moment. The FMR measurements reveal that Fe5GeTe2 has a damping constant comparable to Permalloy. With reducing temperature, the linewidth was broadened. Together with the VSM data, our measurements indicate that Fe5GeTe2 transitions from ferromagnetic to ferrimagnetic at lower temperatures. Our experiments highlight key information regarding the magnetic state and spin scattering processes in Fe5GeTe2, which promote the understanding of magnetism in Fe5GeTe2, leading to implementations of Fe5GeTe2 based room-temperature spintronic devices.},
doi = {10.1088/2053-1583/ac2028},
journal = {2D Materials},
number = 4,
volume = 8,
place = {United States},
year = {Mon Sep 13 00:00:00 EDT 2021},
month = {Mon Sep 13 00:00:00 EDT 2021}
}
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