1. Isotropic Nature of the Metallic Kagome Ferromagnet Fe 3 Sn 2 at High Temperatures.
- Author
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Dally RL, Phelan D, Bishop N, Ghimire NJ, and Lynn JW
- Abstract
Anisotropy and competing exchange interactions have emerged as two central ingredients needed for centrosymmetric materials to exhibit topological spin textures. Fe
3 Sn2 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 Fe3 Sn2 is an isotropic ferromagnet below T C ≈ 660 K to at least 480 K - the lower temperature threshold of our experimental configuration. Fe3 Sn2 is known to have competing magnetic exchange interactions, correlated electron behavior, weak magnetocrystalline anisotropy, and lattice anisotropy; all of these features are thought to play a role in stabilizing skyrmions in centrosymmetric systems. Our results reveal that at elevated temperatures, there is an absence of magnetocrystalline anisotropy and that the system behaves as a typical exchange ferromagnet with a spin stiffness D T = 0 K = 271 ± 9 meV Å 2 ., Competing Interests: Conflicts of Interest: The identification of any commercial product or trade name does not imply endorsement or recommendation by the National Institute of Standards and Technology. The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.- Published
- 2021
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