Scattering mechanisms in textured FeGe thin films: magnetoresistance and the anomalous Hall effect

Abstract

A textured thin film of FeGe was grown by magnetron sputtering with a helimagnetic ordering temperature of TN = 276 +/- 2 K. From 5 K to room temperature a variety of scattering processes contribute towards the overall longitudinal and Hall resistivities. These were studied by combining magnetometry and magnetotransport measurements. The high-field magnetoresistance (MR) displays three clear temperature regimes: Lorentz force MR dominates at low temperatures, above T ~ 80 K scattering from spin-waves predominates, whilst finally for T > 200 K scattering from fluctuating local moments describes the MR. At low fields, where the magnetisation is no longer technically saturated, we find a scaling of magnetoresistance with the square of the magnetisation, indicating that the MR due to the unwinding of spins in the conical phase arises from a similar mechanism to that in magnetic domain walls. This MR is only visible up to a temperature of about 200 K. No features can be found in the temperature or field dependence of the longitudinal resistivity that belie the presence of the underlying magnetic phase transition at TN: the marked changes in behavior are at much lower temperatures. The anomalous Hall effect has a dramatic temperature dependence in which the anomalous Hall resistivity scales quadratically with the longitudinal resistivity: comparison with anomalous Hall scaling theory shows that our system is in the intrinsic 'moderately dirty' regime. Lastly, we find evidence of a topological Hall effect of size 100 ~Ohm cm.

8 pages, 6 figures

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• Current-induced skyrmion dynamics in constricted geometries
• Quantum transport theory of anomalous electric, thermoelectric, and thermal Hall effects in ferromagnets
• Microscopic approach to current-driven domain wall dynamics
• Robust formation of skyrmions and topological Hall effect in epitaxial thin films of MnSi
• Linear magnetization dependence of the intrinsic anomalous Hall effect
• Fluctuation-induced first-order phase transition in Dzyaloshinskii-Moriya helimagnets
• Extended elliptic skyrmion gratings in epitaxial MnSi thin films
• Metallic State in Cubic FeGe beyond its Quantum Phase Transition

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