L A Fenner et al 2009 J. Phys.: Condens. Matter 21 452202 doi:10.1088/0953-8984/21/45/452202
Non-collinearity and spin frustration in the itinerant kagome ferromagnet Fe3Sn2
FREE ARTICLEL A Fenner1, A A Dee1 and A S Wills1,2
Show affiliationsFAST TRACK COMMUNICATION
Frustrated itinerant ferromagnets, with non-collinear static spin structures, are an exciting class of material as their spin chirality can introduce a Berry phase in the electronic scattering and lead to exotic electronic phenomena such as the anomalous Hall effect (AHE).
This study presents a reexamination of the magnetic properties of Fe3Sn2, a metallic ferromagnet, based on the two-dimensional kagome bilayer structure. Previously thought of as a conventional ferromagnet, we show using a combination of SQUID (superconducting quantum interference device) measurements, symmetry analysis and powder neutron diffraction that Fe3Sn2 is a frustrated ferromagnet with a temperature-dependent non-collinear spin structure. The complexity of the magnetic interactions is further evidenced by a re-entrant spin glass transition (
K) at temperatures far below the main ferromagnetic transition (TC = 640 K).
Fe3Sn2 therefore provides a rare example of a frustrated itinerant ferromagnet. Further, as well as being of great fundamental interest our studies highlight the potential of Fe3Sn2 for practical application in spintronics technology, as the AHE arising from the ferromagnetism in this material is expected to be enhanced by the coupling between the conduction electrons and the non-trivial magnetic structure over an exceptionally wide temperature range.
- PACS
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75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
72.15.Gd Galvanomagnetic and other magnetotransport effects
- Subjects
- Dates
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Issue 45 (11 November 2009)
Received 31 July 2009, in final form 11 September 2009
Published 9 October 2009
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Non-collinearity and spin frustration in the itinerant kagome ferromagnet Fe3Sn2
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