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Title: Exploring the origins of the Dzyaloshinskii-Moriya interaction in MnSi

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [1];  [1]
  1. Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics and Astronomy
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Chemistry

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. Lastly, 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.

Research Organization:
Louisiana State Univ., Baton Rouge, LA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012432; AC05-00OR22725
OSTI ID:
1414441
Alternate ID(s):
OSTI ID: 1414042; OSTI ID: 1423069
Journal Information:
Physical Review B, Vol. 96, Issue 21; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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Cited By (2)

Effect of Ge substitution on magnetic properties in the itinerant chiral magnet MnSi journal October 2019
Effect of Ge-substitution on Magnetic Properties in the Itinerant Chiral Magnet MnSi text January 2019

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