Open AccessObservation of topological Hall effect in Mn2RhSn films
Author(s) -
Kumari Gaurav Rana,
O. Meshcheriakova,
J. Kübler,
Benedikt Ernst,
Julie Karel,
R. Hillebrand,
Eckhard Pippel,
P. Werner,
Ajaya K. Nayak,
Claudia Felser,
Stuart S. P. Parkin
Publication year - 2016
Publication title -
new journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.584
H-Index - 190
ISSN - 1367-2630
DOI - 10.1088/1367-2630/18/8/085007
Subject(s) - hall effect , condensed matter physics , berry connection and curvature , physics , ferromagnetism , curie temperature , hall conductivity , magnetization , thermal hall effect , heusler compound , electrical resistivity and conductivity , magnetic field , geometric phase , quantum mechanics
Recently non-collinear magnetic structures have attracted renewed attention due to the novel Hall effects that they display. In earlier work evidence for a non-collinear magnetic structure has been reported for the ferromagnetic Heusler compound Mn 2 RhSn. Using sputtering techniques we have prepared high quality epitaxial thin films of Mn 2 RhSn by high temperature growth on MgO (001) substrates. The films are tetragonally distorted with an easy magnetization axis along the c -axis. Moreover, we find evidence for an anomalous Hall effect whose magnitude increases strongly below the Curie temperature that is near room temperature. Consistent with theoretical calculations of the anomalous Hall conductivity that we have carried out by deriving the Berry curvature from the electronic structure of perfectly ordered Mn 2 RhSn, the sign of the anomalous Hall conductivity is negative, although the measured value is considerably smaller than the calculated value. We attribute this difference to small deviations in stoichiometry and chemical ordering. We also find evidence for a topological Hall resistivity of about 50 nΩ cm, which is ∼5 of the anomalous Hall effect, for temperatures below 100 K. The topological Hall effect signifies the presence of a chiral magnetic structure that evolves from the non-collinear magnetic structure that Mn 2 RhSn is known to exhibit