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Article

Isotropic Nature of the Metallic Kagome Ferromagnet Fe3Sn2 at High Temperatures

1
NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899-6102, USA
2
Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA
3
Department of Physics and Astronomy, George Mason University, Fairfax, VA 22030, USA
4
Quantum Science and Engineering Center, George Mason University, Fairfax, VA 22030, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Artem Pronin
Crystals 2021, 11(3), 307; https://doi.org/10.3390/cryst11030307
Received: 7 March 2021 / Revised: 15 March 2021 / Accepted: 18 March 2021 / Published: 20 March 2021
(This article belongs to the Special Issue Advances in Topological Materials)
Anisotropy and competing exchange interactions have emerged as two central ingredients needed for centrosymmetric materials to exhibit topological spin textures. Fe3Sn2 is thought to have these ingredients as well, as it has recently been discovered to host room temperature skyrmionic bubbles with an accompanying topological Hall effect. We present small-angle inelastic neutron scattering measurements that unambiguously show that Fe3Sn2 is an isotropic ferromagnet below TC660 K to at least 480 K—the lower temperature threshold of our experimental configuration. Fe3Sn2 is known to have competing magnetic exchange interactions, correlated electron behavior, weak magnetocrystalline anisotropy, and lattice (spatial) anisotropy; all of these features are thought to play a role in stabilizing skyrmions in centrosymmetric systems. Our results reveal that at the elevated temperatures measured, there is an absence of significant magnetocrystalline anisotropy and that the system behaves as a nearly ideal isotropic exchange interaction ferromagnet, with a spin stiffness D(T=480 K)=168 meV Å2, which extrapolates to a ground state spin stiffness D(T=0 K)=231 meV Å2. View Full-Text
Keywords: inelastic neutron scattering; topological materials; anomalous Hall effect; isotropic ferromagnet; kagome; frustrated magnetism; skyrmion; magnetization inelastic neutron scattering; topological materials; anomalous Hall effect; isotropic ferromagnet; kagome; frustrated magnetism; skyrmion; magnetization
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MDPI and ACS Style

Dally, R.L.; Phelan, D.; Bishop, N.; Ghimire, N.J.; Lynn, J.W. Isotropic Nature of the Metallic Kagome Ferromagnet Fe3Sn2 at High Temperatures. Crystals 2021, 11, 307. https://doi.org/10.3390/cryst11030307

AMA Style

Dally RL, Phelan D, Bishop N, Ghimire NJ, Lynn JW. Isotropic Nature of the Metallic Kagome Ferromagnet Fe3Sn2 at High Temperatures. Crystals. 2021; 11(3):307. https://doi.org/10.3390/cryst11030307

Chicago/Turabian Style

Dally, Rebecca L., Daniel Phelan, Nicholas Bishop, Nirmal J. Ghimire, and Jeffrey W. Lynn 2021. "Isotropic Nature of the Metallic Kagome Ferromagnet Fe3Sn2 at High Temperatures" Crystals 11, no. 3: 307. https://doi.org/10.3390/cryst11030307

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