Phase Stabilities and Magnetic Properties of Mn-Deficient and Ge-Substituted Mn3Ga with D022 Structure

Hironari Okada; Toru Sasaki; Yudai Syoji; Rie Y. Umetsu

doi:10.1109/TMAG.2017.2695638

Phase Stabilities and Magnetic Properties of Mn-Deficient and Ge-Substituted Mn₃Ga with D0₂₂ Structure

Hironari Okada, Toru Sasaki, Yudai Syoji, Rie Y. Umetsu

Cooperative Research and Development Center for Advanced Materials

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

We have investigated phase stabilities and magnetic properties of the tetragonal D0₂₂ phase in Mn-deficient Mn_3-xGa and Ge-substituted Mn₃Ga_1-yGe_y. A transition from the D0₂₂ to L1₀ phase is observed in the composition range of x=0.5-0.8 in Mn_3-xGa. On the other hand, the D0₂₂ phase is confirmed in the overall composition of Mn₃Ga_1-yGe_y. The thermal stability of the D0₂₂ phase strongly depends on the Ge content compared with the Mn deficiency. Magnetization of Mn_3-xGa is increased by introducing the Mn deficiency, whereas that of Mn₃Ga_1-yGe_y decreases with increasing Ge content despite a constant number of Mn atoms. This result suggests that the magnitude of magnetic moment of Mn atom in Mn₃Ga_1-yGe_y is influenced by variations of valence electron and structural properties caused by the Ge substitution.

Original language	English
Article number	7904670
Journal	IEEE Transactions on Magnetics
Volume	53
Issue number	11
DOIs	https://doi.org/10.1109/TMAG.2017.2695638
Publication status	Published - 2017 Nov

Keywords

Magnetic anisotropy
magnetization
manganese alloy
phase stability
tetragonal structure

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/TMAG.2017.2695638

Cite this

@article{1405b75c54b84c77a175861d06fec8e6,

title = "Phase Stabilities and Magnetic Properties of Mn-Deficient and Ge-Substituted Mn3Ga with D022 Structure",

abstract = "We have investigated phase stabilities and magnetic properties of the tetragonal D022 phase in Mn-deficient Mn3-xGa and Ge-substituted Mn3Ga1-yGey. A transition from the D022 to L10 phase is observed in the composition range of x=0.5-0.8 in Mn3-xGa. On the other hand, the D022 phase is confirmed in the overall composition of Mn3Ga1-yGey. The thermal stability of the D022 phase strongly depends on the Ge content compared with the Mn deficiency. Magnetization of Mn3-xGa is increased by introducing the Mn deficiency, whereas that of Mn3Ga1-yGey decreases with increasing Ge content despite a constant number of Mn atoms. This result suggests that the magnitude of magnetic moment of Mn atom in Mn3Ga1-yGey is influenced by variations of valence electron and structural properties caused by the Ge substitution.",

keywords = "Magnetic anisotropy, magnetization, manganese alloy, phase stability, tetragonal structure",

author = "Hironari Okada and Toru Sasaki and Yudai Syoji and Umetsu, {Rie Y.}",

note = "Funding Information: ACKNOWLEDGMENT This work was supported in part by Japan Science and Technology Agency through the “Collaborative Research Based on Industrial Demand” program and in part by the Tohoku Gakuin University through the “Hi-tech Research Center.” Publisher Copyright: {\textcopyright} 1965-2012 IEEE.",

year = "2017",

month = nov,

doi = "10.1109/TMAG.2017.2695638",

language = "English",

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journal = "IEEE Transactions on Magnetics",

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T1 - Phase Stabilities and Magnetic Properties of Mn-Deficient and Ge-Substituted Mn3Ga with D022 Structure

AU - Okada, Hironari

AU - Sasaki, Toru

AU - Syoji, Yudai

AU - Umetsu, Rie Y.

N1 - Funding Information: ACKNOWLEDGMENT This work was supported in part by Japan Science and Technology Agency through the “Collaborative Research Based on Industrial Demand” program and in part by the Tohoku Gakuin University through the “Hi-tech Research Center.” Publisher Copyright: © 1965-2012 IEEE.

PY - 2017/11

Y1 - 2017/11

N2 - We have investigated phase stabilities and magnetic properties of the tetragonal D022 phase in Mn-deficient Mn3-xGa and Ge-substituted Mn3Ga1-yGey. A transition from the D022 to L10 phase is observed in the composition range of x=0.5-0.8 in Mn3-xGa. On the other hand, the D022 phase is confirmed in the overall composition of Mn3Ga1-yGey. The thermal stability of the D022 phase strongly depends on the Ge content compared with the Mn deficiency. Magnetization of Mn3-xGa is increased by introducing the Mn deficiency, whereas that of Mn3Ga1-yGey decreases with increasing Ge content despite a constant number of Mn atoms. This result suggests that the magnitude of magnetic moment of Mn atom in Mn3Ga1-yGey is influenced by variations of valence electron and structural properties caused by the Ge substitution.

AB - We have investigated phase stabilities and magnetic properties of the tetragonal D022 phase in Mn-deficient Mn3-xGa and Ge-substituted Mn3Ga1-yGey. A transition from the D022 to L10 phase is observed in the composition range of x=0.5-0.8 in Mn3-xGa. On the other hand, the D022 phase is confirmed in the overall composition of Mn3Ga1-yGey. The thermal stability of the D022 phase strongly depends on the Ge content compared with the Mn deficiency. Magnetization of Mn3-xGa is increased by introducing the Mn deficiency, whereas that of Mn3Ga1-yGey decreases with increasing Ge content despite a constant number of Mn atoms. This result suggests that the magnitude of magnetic moment of Mn atom in Mn3Ga1-yGey is influenced by variations of valence electron and structural properties caused by the Ge substitution.

KW - Magnetic anisotropy

KW - magnetization

KW - manganese alloy

KW - phase stability

KW - tetragonal structure

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