Exploring the origins of the Dzyalloshinski-Moria interaction in MnSi

Abstract

By using magnetization and small-angle neutron scattering (SANS) measurements, we have investigated the magnetic behavior of Mn_{1-x}Ir_{x}Si system to explore the effect of increased carrier density and spin-orbit interaction on the magnetic properties of MnSi. We determine estimates of the spin wave stiffness and the Dzyalloshinski-Moria, DM, interaction strength and compare with Mn_{1-x}Co_{x}Si and Mn_{1-x}Fe_{x}Si. Despite the large differences in atomic mass and size of the substituted elements, Mn_{1-x}Co_{x}Si and Mn_{1-x}Ir_{x}Si show nearly identical variations in their magnetic properties with substitution. We find a systematic dependence of the transition temperature, the ordered moment, the helix period and the DM interaction strength with electron count for Mn{1-x}Ir{x}Si, Mn_{1-x}Co_{x}Si, and Mn_{1-x}Fe_{x}Si indicating that the magnetic behavior is primarily dependent upon the additional carrier density rather than on the mass or size of the substituting species. This indicates that the variation in magnetic properties, including the DM interaction strength, are primarily controlled by the electronic structure as Co and Ir are isovalent. Our work suggests that although the rigid band model of electronic structure along with Moira's model of weak itinerant magnetism describe this system surprisingly well, phenomenological models for the DM interaction strength are not adequate to describe this system.

arXiv comment17 pages, 7 Figures

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• Controlling Dzyaloshinskii-Moriya interactions in the skyrmion host candidates FePd${}_{1-x}$Pt${}_x$Mo${}_3$N
• Flat band magnetism and helical magnetic order in Ni-doped SrCo${}_2$As${}_2$
• Increasing the skyrmion stability in Cu${}_2$OSeO${}_3$ by chemical substitution
• Unpinning the skyrmion lattice in MnSi:Effect of substitutional disorder
• Anomalous helimagnetic domain shrinkage due to the weakening of Dzyaloshinskii-Moriya interaction in CrAs
• Entropic signatures of the skyrmion lattice phase in MnSi1-xAlx and Fe1-yCoySi
• Topological Hall effect and the magnetic states of Nowotney chimney ladder compound Cr${}_{11}$Ge${}_{19}$}
• Effect of Ge-substitution on Magnetic Properties in the Itinerant Chiral Magnet MnSi
• Direct observations of spin fluctuations in spin-hedgehog-anti-hedgehog lattice states in MnSi${}_{1-x}$Ge${}_x$ ($x=0.6$ and $0.8$) at zero magnetic field
• Structural and magnetic properties of CoTeMoO${}_6$ revisited