Exploring the origins of the Dzyaloshinskii-Moriya interaction in MnSi

C. Dhital, L. Debeer-Schmitt, Q. Zhang, W. Xie, D. P. Young, J. F. Ditusa

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21 Scopus citations

Abstract

By using magnetization and small-angle neutron scattering measurements, we have investigated the magnetic behavior of the Mn1-xIrxSi 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 Dzyaloshinskii-Moriya (DM) interaction strength and compare with Mn1-xCoxSi and Mn1-xFexSi. Despite the large differences in atomic mass and size of the substituted elements, Mn1-xCoxSi and Mn1-xIrxSi 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 Mn1-xIrxSi,Mn1-xCoxSi, and Mn1-xFexSi, 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, is 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 Moriya's model of weak itinerant magnetism, describes this system surprisingly well, phenomenological models for the DM interaction strength are not adequate to describe this system.

Original languageEnglish
Article number214425
JournalPhysical Review B
Volume96
Issue number21
DOIs
StatePublished - Dec 19 2017

Funding

The authors acknowledge Dr. Clayton Loehn and Dr. Nele Muttik at the Shared Instrumentation Facility (SIF) at LSU for assistance with the chemical analysis. We also thank D. A. Browne, R. Jin, and I. Vekhter for helpful discussions. This material is based upon work supported by the U.S. Department of Energy under EPSCoR Grant No. DE-SC0012432, with additional support from the Louisiana Board of Regents. The SANS data and alignment of the samples used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. W. Xie was supported by the Louisiana Board of Regents Research Competitiveness Subprogram (RCS) under Contract No. LEQSF(2017-20)-RD-A-08 for the single crystal x-ray diffraction.

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