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Title: Unpinning the skyrmion lattice in MnSi: Effect of substitutional disorder

Abstract

By employing magnetization and small angle neutron scattering measurements, we have investigated the behavior of the skyrmion lattice (SKL) and the helical order in MnSi 0.992Ga 0.008. Our results indicate that the order of the SKL is sensitive to the orientation of an applied magnetic field with respect to the crystal lattice and to variations in the sequence of small temperature and applied magnetic field changes. The disorder caused by the substitution of the heavier element Ga for Si is sufficient to reduce the pinning of the SKL to the underlying crystalline lattice, reducing the propensity for the SKL to be aligned with the crystal lattice. This tendency is most evident when the applied field is not well oriented with respect to the high symmetry axes of the crystal resulting in disorder in the long range SKL while maintaining sharp short range (radial) order. We have also investigated the effect of substituting heavier elements into MnSi on the reorientation process of the helical domains with field cycling in MnSi 0.992Ga 0.008 and Mn 0.985Ir 0.015Si A comparison of the reorientation process in these materials with field reduction indicates that the substitution of heavier elements on either Mn or Si sitesmore » creates a higher energy barrier for the reorientation of the helical order and for the formation of domains.« less

Authors:
 [1]; ORCiD logo [2];  [3];  [3]
  1. Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics and Astronomy; Kennesaw State Univ., Marietta, GA (United States). Dept. of Physics
  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
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1492148
Alternate Identifier(s):
OSTI ID: 1491937
Grant/Contract Number:  
AC05-00OR22725; SC0012432
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 2; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Dhital, C., DeBeer-Schmitt, L., Young, D. P., and DiTusa, J. F. Unpinning the skyrmion lattice in MnSi: Effect of substitutional disorder. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.024428.
Dhital, C., DeBeer-Schmitt, L., Young, D. P., & DiTusa, J. F. Unpinning the skyrmion lattice in MnSi: Effect of substitutional disorder. United States. doi:10.1103/PhysRevB.99.024428.
Dhital, C., DeBeer-Schmitt, L., Young, D. P., and DiTusa, J. F. Thu . "Unpinning the skyrmion lattice in MnSi: Effect of substitutional disorder". United States. doi:10.1103/PhysRevB.99.024428.
@article{osti_1492148,
title = {Unpinning the skyrmion lattice in MnSi: Effect of substitutional disorder},
author = {Dhital, C. and DeBeer-Schmitt, L. and Young, D. P. and DiTusa, J. F.},
abstractNote = {By employing magnetization and small angle neutron scattering measurements, we have investigated the behavior of the skyrmion lattice (SKL) and the helical order in MnSi0.992Ga0.008. Our results indicate that the order of the SKL is sensitive to the orientation of an applied magnetic field with respect to the crystal lattice and to variations in the sequence of small temperature and applied magnetic field changes. The disorder caused by the substitution of the heavier element Ga for Si is sufficient to reduce the pinning of the SKL to the underlying crystalline lattice, reducing the propensity for the SKL to be aligned with the crystal lattice. This tendency is most evident when the applied field is not well oriented with respect to the high symmetry axes of the crystal resulting in disorder in the long range SKL while maintaining sharp short range (radial) order. We have also investigated the effect of substituting heavier elements into MnSi on the reorientation process of the helical domains with field cycling in MnSi0.992Ga0.008 and Mn0.985Ir0.015Si A comparison of the reorientation process in these materials with field reduction indicates that the substitution of heavier elements on either Mn or Si sites creates a higher energy barrier for the reorientation of the helical order and for the formation of domains.},
doi = {10.1103/PhysRevB.99.024428},
journal = {Physical Review B},
number = 2,
volume = 99,
place = {United States},
year = {2019},
month = {1}
}

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Works referenced in this record:

Tight-binding approach to the orbital magnetic moment and magnetocrystalline anisotropy of transition-metal monolayers
journal, January 1989