Composition-dependent magnetic response properties of Mn${}_{1-x}$Fe${}_x$Ge alloys

Abstract

The composition-dependent behavior of the Dzyaloshinskii-Moriya interaction (DMI), the spin-orbit torque (SOT), as well as anomalous and spin Hall conductivities of Mn${}_{1-x}$Fe${}_x$Ge alloys have been investigated by first-principles calculations using the relativistic multiple scattering Korringa-Kohn-Rostoker (KKR) formalism. The $D_{\mathrm{xx}}$ component of the DMI exhibits a strong dependence on the Fe concentration, changing sign at $x\approx 0.85$ in line with previous theoretical calculations as well as with experimental results demonstrating the change of spin helicity at $x\approx 0.8$. A corresponding behavior with a sign change at $x\approx 0.5$ is predicted also for the Fermi sea contribution to the SOT, as this is closely related to the DMI. In the case of anomalous and spin Hall effects it is shown that the calculated Fermi sea contributions are rather small and the composition-dependent behavior of these effects are determined mainly by the electronic states at the Fermi level. The spin-orbit-induced scattering mechanisms responsible for both these effects suggest a common origin of the minimum of the AHE and the sign change of the SHE conductivities.

References in corpus (15)

• Anomalous Hall effect
• Topological Hall effect and Berry phase in magnetic nanostructures
• Skyrmions with varying size and helicity in composition-spread helimagnetic alloys
• Symmetry-imposed shape of linear response tensors
• Berry phase theory of Dzyaloshinskii-Moriya interaction and spin-orbit torques
• Doppler shift picture of the Dzyaloshinskii--Moriya interaction
• Dzyaloshinskii-Moriya interaction and Hall effects in the skyrmion phase of MnFeGe alloys
• Topological Spin Hall Effect due to Magnetic Skyrmions
• A fully relativistic description of spin-orbit torques by means of linear response theory
• Fermi sea term in the relativistic linear muffin-tin-orbital transport theory for random alloys
• An accurate scheme to calculate the interatomic Dzyaloshinskii-Moriya interaction parameters
• On calculating the Berry curvature of Bloch electrons using the KKR method
• Spin projection and spin current density within relativistic electronic transport calculations
• Controlling skyrmion helicity via engineered Dzyaloshinskii-Moriya interactions
• Skyrmion magnetic structure of an ordered FePt monolayer deposited on Pt(111)

Cited by in corpus (6)

• Ab initio analysis of magnetic properties of prototype B20 chiral magnet FeGe
• Short period magnetization texture of B20-MnGe explained by thermally fluctuating local moments
• Complex magnetism of B20-MnGe: from spin-spirals, hedgehogs to monopoles
• Onset of a skyrmion phase by chemical substitution in MnGe chiral magnet
• Spin-wave stiffness and micromagnetic exchange interactions expressed by means of the KKR Green function approach
• Cubic B20 helimagnets with quenched disorder in magnetic field