Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: Spintronics

MA 18.6: Vortrag

Dienstag, 6. September 2022, 16:15–16:30, H47

Anisotropic magnetoresistance in systems with non-collinear magnetic order — •Philipp Ritzinger and Karel Vyborny — Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague 8, Czech Republic

Since its discovery in 1857 by William Thomson, the anisotropic magnetoresistance (AMR) has been in focus of many theoretical studies seeking to understand the microscopic mechanisms of this effect. Most attention has been paid to ferromagnets (FMs) and recently, the scope of research on AMR is extended to include also antiferromagnets (AFMs). AMR can be due to anisotropic scattering (extrinsic) or an anisotropic Fermi surface (intrinsic). Here we focus on the latter, much less investigated intrinsic mechanism, which is achieved by considering non-collinear magnetic order inspired by real materials such as CrSe, delta-FeMn, Mn3Ge or RbFe(MoO4)2. We explore various types of lattices on toymodel level amongst which are trigonal, tetraedral or Kagome lattice. Magnetic moments can be arranged in many different ways on such lattices and seemingly small changes alter the Fermi surface symmetry, spin texture and transport properites. We have investigated systematically the influence of magnetic ordering on these properties which allows to predict general features of spin texture and transport by only considering the symmetry of the underlying system. As an example of these effects we have shown that AFM systems without spin-orbit coupling on Kagome lattices can develop anisotropy in the electric conductivity under applied in-plane magnetic field. This does not occur in FMs without spin-orbit coupling.