Europhys. Lett.
Volume 74, Number 1, April 2006
Page(s) 163 - 169
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 March 2006
Europhys. Lett., 74 (1), pp. 163-169 (2006)
DOI: 10.1209/epl/i2005-10506-3

The role of the symmetry of spin fluctuation coherence on magnetotransport in $\chem{Fe_3Si}$ thin films

M. Bowen, K.-J. Friedland, J. Herfort, H.-P. Schönherr and K. H. Ploog

Paul Drude Institute for Solid State Electronics Hausvogteiplatz 5-7, 10117 Berlin, Germany

received 15 November 2005; accepted in final form 9 February 2006
published online 1 March 2006

We have observed an abrupt change at low temperatures in the intrinsic anomalous and planar Hall conductivities of nearly stoichiometric $\chem{Fe_3Si}$ epitaxial thin films grown on GaAs(001). To describe this magnetotransport regime, we phenomenologically take into account the reduction in symmetry resulting from the onset of coherent spin fluctuations. Our theoretical approach can thus account for these different magnetotransport regimes in both the anomalous Hall effect and planar Hall effect as well as the impact on intrinsic magnetotransport of atomic disorder away from stoichiometry.

75.47.Np - Magnetotransport phenomena; materials for magnetotransport: Metals and alloys.
72.15.Eb - Electrical and thermal conduction in crystalline metals and alloys.
75.50.Bb - Studies of specific magnetic materials: Fe and its alloys.

© EDP Sciences 2006