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Non-collinearity and spin frustration in the itinerant kagome ferromagnet Fe3Sn2

Fenner, LA; Dee, AA; Wills, AS; (2009) Non-collinearity and spin frustration in the itinerant kagome ferromagnet Fe3Sn2. J PHYS-CONDENS MAT , 21 (45) , Article 452202. 10.1088/0953-8984/21/45/452202.

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Abstract

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 (Tf similar or equal to 80 K) at temperatures far below the main ferromagnetic transition (T-C = 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.

Type:Article
Title:Non-collinearity and spin frustration in the itinerant kagome ferromagnet Fe3Sn2
DOI:10.1088/0953-8984/21/45/452202
Keywords:GADOLINIUM GALLIUM GARNET, NONEQUILIBRIUM DYNAMICS, MAGNETIC-STRUCTURES, BERRY PHASE, ANTIFERROMAGNET, GLASS, ICE, SUSCEPTIBILITY, TRANSITIONS, JAROSITES
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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