Effect of Ge substitution on magnetic properties in the itinerant chiral magnet MnSi
Abstract
We have investigated the effect of Ge substitution on the magnetic ordering in the B20 itinerant chiral magnet MnSi prepared by melting and annealing under ambient pressure. From a metallurgical survey, the solubility limit of Ge was found to be x = 0.144(5) with annealing temperature Tan = 1073 K. Magnetization measurements on MnSi1–xGex samples show that the helical ordering temperature Tc increases rapidly in the low-x range, whereas it becomes saturated at higher concentration x > 0.1. Here, the Ge substitution also increases both the saturation magnetization Ms and the critical field to the fully polarized state Hc2. In contrast to the saturation behavior of Tc, those parameters increase linearly up to the highest Ge concentration investigated. In the temperature-magnetic field phase diagram, we found enlargement of the skyrmion phase region for large x samples. We, furthermore, observed the nonlinear behavior of helical modulation vector k as a function of Ge concentration, which can be described qualitatively using the mean field approximation.
- Authors:
-
[1];
[1];
[2];
- Tohoku Univ., Sendai (Japan)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1570897
- Alternate Identifier(s):
- OSTI ID: 1607533
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 10; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Aji, Seno, Ishida, Hidesato, Okuyama, Daisuke, Nawa, Kazuhiro, Hong, Tao, and Sato, Taku J. Effect of Ge substitution on magnetic properties in the itinerant chiral magnet MnSi. United States: N. p., 2019.
Web. doi:10.1103/PhysRevMaterials.3.104408.
Aji, Seno, Ishida, Hidesato, Okuyama, Daisuke, Nawa, Kazuhiro, Hong, Tao, & Sato, Taku J. Effect of Ge substitution on magnetic properties in the itinerant chiral magnet MnSi. United States. https://doi.org/10.1103/PhysRevMaterials.3.104408
Aji, Seno, Ishida, Hidesato, Okuyama, Daisuke, Nawa, Kazuhiro, Hong, Tao, and Sato, Taku J. Mon .
"Effect of Ge substitution on magnetic properties in the itinerant chiral magnet MnSi". United States. https://doi.org/10.1103/PhysRevMaterials.3.104408. https://www.osti.gov/servlets/purl/1570897.
@article{osti_1570897,
title = {Effect of Ge substitution on magnetic properties in the itinerant chiral magnet MnSi},
author = {Aji, Seno and Ishida, Hidesato and Okuyama, Daisuke and Nawa, Kazuhiro and Hong, Tao and Sato, Taku J.},
abstractNote = {We have investigated the effect of Ge substitution on the magnetic ordering in the B20 itinerant chiral magnet MnSi prepared by melting and annealing under ambient pressure. From a metallurgical survey, the solubility limit of Ge was found to be x = 0.144(5) with annealing temperature Tan = 1073 K. Magnetization measurements on MnSi1–xGex samples show that the helical ordering temperature Tc increases rapidly in the low-x range, whereas it becomes saturated at higher concentration x > 0.1. Here, the Ge substitution also increases both the saturation magnetization Ms and the critical field to the fully polarized state Hc2. In contrast to the saturation behavior of Tc, those parameters increase linearly up to the highest Ge concentration investigated. In the temperature-magnetic field phase diagram, we found enlargement of the skyrmion phase region for large x samples. We, furthermore, observed the nonlinear behavior of helical modulation vector k as a function of Ge concentration, which can be described qualitatively using the mean field approximation.},
doi = {10.1103/PhysRevMaterials.3.104408},
journal = {Physical Review Materials},
number = 10,
volume = 3,
place = {United States},
year = {2019},
month = {10}
}
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Figures / Tables:
FIG. 1: (a) The composition determined by the EDX analysis of the main phase of MnSi1−xGex alloys annealed at Tan = 1073, 1173, and 1273 K for 5 days, as a function of nominal composition, (b) lattice constants of all prepared samples at different annealing temperatures, as a function ofmore »
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