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  Helical magnetic structure and the anomalous and topological Hall effects in epitaxial B20 Fe1-yCoyGe films

Spencer, C. S., Gayles, J., Porter, N. A., Sugimoto, S., Aslam, Z., Kinane, C. J., et al. (2018). Helical magnetic structure and the anomalous and topological Hall effects in epitaxial B20 Fe1-yCoyGe films. Physical Review B, 97(21): 214406, pp. 1-19. doi:10.1103/PhysRevB.97.214406.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-93FF-A Version Permalink: http://hdl.handle.net/21.11116/0000-0001-9441-E
Genre: Journal Article

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 Creators:
Spencer, Charles S.1, Author
Gayles, Jacob2, Author              
Porter, Nicholas A.1, Author
Sugimoto, Satoshi1, Author
Aslam, Zabeada1, Author
Kinane, Christian J.1, Author
Charlton, Timothy R.1, Author
Freimuth, Frank1, Author
Chadov, Stanislav3, Author              
Langridge, Sean1, Author
Sinova, Jairo1, Author
Felser, Claudia4, Author              
Bluegel, Stefan1, Author
Mokrousov, Yuriy1, Author
Marrows, Christopher H.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Stanislav Chadov, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863440              
4Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: Epitaxial films of the B20-structure compound Fe1-yCoyGe were grown by molecular beam epitaxy on Si (111) substrates. The magnetization varied smoothly from the bulklike values of one Bohr magneton per Fe atom for FeGe to zero for nonmagnetic CoGe. The chiral lattice structure leads to a Dzyaloshinskii-Moriya interaction (DMI), and the films' helical magnetic ground state was confirmed using polarized neutron reflectometry measurements. The pitch of the spin helix, measured by this method, varies with Co content y and diverges at y similar to 0.45. This indicates a zero crossing of the DMI, which we reproduced in calculations using first-principles methods. We also measured the longitudinal and Hall resistivity of our films as a function of magnetic field, temperature, and Co content y. The Hall resistivity is expected to contain contributions from the ordinary, anomalous, and topological Hall effects. Both the anomalous and topological Hall resistivities show peaks around y similar to 0.5. Our first-principles calculations show a peak in the topological Hall constant at this value of y, related to the strong spin polarization predicted for intermediate values of y. Our calculations predict half-metallicity for y = 0.6, consistent with the experimentally observed linear magnetoresistance at this composition, and potentially related to the other unusual transport properties for intermediate value of y. While it is possible to reconcile theory with experiment for the various Hall effects for FeGe, the large topological Hall resistivities for y similar to 0.5 are much larger than expected when the very small emergent fields associated with the divergence in the DMI are taken into account.

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Language(s): eng - English
 Dates: 2018-06-062018-06-06
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 97 (21) Sequence Number: 214406 Start / End Page: 1 - 19 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008