skip to main content

DOE PAGESDOE PAGES

This content will become publicly available on December 19, 2018

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

By using magnetization and small-angle neutron scattering (SANS) measurements, we have investigated the magnetic behavior of the Mn 1-xIr xSi 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-Moriya (DM) interaction strength and compare with Mn 1-xCo xSi and Mn 1-xFe xSi. Despite the large differences in atomic mass and size of the substituted elements, Mn 1-xCo xSi and Mn 1-xIr xSi 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-xIr xSi, Mn 1-xCo xSi, and Mn 1-xFe xSi, 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 surprisinglymore » well, phenomenological models for the DM interaction strength are not adequate to describe this system.« less
Authors:
 [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
Publication Date:
Grant/Contract Number:
SC0012432; AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 21; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Louisiana State Univ., Baton Rouge, LA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1414441
Alternate Identifier(s):
OSTI ID: 1414042; OSTI ID: 1423069