Magnetic and chemical order-disorder transformations in Co 2Fe(Ga 1-xSi x) and Co 2Fe(Al 1-ySi y) Heusler alloys

Rie Y. Umetsu; Akinari Okubo; Ryosuke Kainuma

doi:10.1063/1.3700220

Magnetic and chemical order-disorder transformations in Co ₂Fe(Ga _1-xSi _x) and Co ₂Fe(Al _1-ySi _y) Heusler alloys

Rie Y. Umetsu, Akinari Okubo, Ryosuke Kainuma

Tohoku University

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

36 Citations (Scopus)

Abstract

The concentration dependence of the order-disorder phase transformation temperature from the L2 ₁ to the B2 phase (T _t ^L21/B2) and magnetic properties of Co ₂Fe(Ga _1-xSi _x) and Co ₂Fe(Al _1-ySi _y) Heusler alloys were investigated. In the phase diagrams, a crossover of the Curie temperature (T _C) and T _t ^L21/B2 was confirmed at around y 0.45 in Co ₂Fe(Al _1-ySi _y), whereas the T _C and T _t ^L21/B2 monotonically changed with x in Co ₂Fe (Ga _1-xSi _x). The slopes of the linear concentration dependence of T _t ^L21/B2 for Co ₂Fe(Al _1-ySi _y) drastically changed at about y 0.45, suggesting that the chemical interchange energy between Fe and Al in Co ₂FeAl alloy is affected by the magnetic ordering.

Original language	English
Article number	073909
Journal	Journal of Applied Physics
Volume	111
Issue number	7
DOIs	https://doi.org/10.1063/1.3700220
Publication status	Published - 2012 Apr 1

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title = "Magnetic and chemical order-disorder transformations in Co 2Fe(Ga 1-xSi x) and Co 2Fe(Al 1-ySi y) Heusler alloys",

abstract = "The concentration dependence of the order-disorder phase transformation temperature from the L2 1 to the B2 phase (T t L21/B2) and magnetic properties of Co 2Fe(Ga 1-xSi x) and Co 2Fe(Al 1-ySi y) Heusler alloys were investigated. In the phase diagrams, a crossover of the Curie temperature (T C) and T t L21/B2 was confirmed at around y 0.45 in Co 2Fe(Al 1-ySi y), whereas the T C and T t L21/B2 monotonically changed with x in Co 2Fe (Ga 1-xSi x). The slopes of the linear concentration dependence of T t L21/B2 for Co 2Fe(Al 1-ySi y) drastically changed at about y 0.45, suggesting that the chemical interchange energy between Fe and Al in Co 2FeAl alloy is affected by the magnetic ordering.",

author = "Umetsu, {Rie Y.} and Akinari Okubo and Ryosuke Kainuma",

note = "Funding Information: The authors are grateful to Professor I. Ohnuma, Tohoku University, and to Emeritus Professor T. Kanomata for their valuable discussions. This study was supported by Grant-in-Aids from the Japanese Society for the Promotion of Science (JSPS) and by the Global COE Program, Tohoku University, MEXT, Japan. Parts of this work were performed at the Center for Low Temperature Science, Institute for Materials Research, Tohoku University. ",

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AU - Kainuma, Ryosuke

N1 - Funding Information: The authors are grateful to Professor I. Ohnuma, Tohoku University, and to Emeritus Professor T. Kanomata for their valuable discussions. This study was supported by Grant-in-Aids from the Japanese Society for the Promotion of Science (JSPS) and by the Global COE Program, Tohoku University, MEXT, Japan. Parts of this work were performed at the Center for Low Temperature Science, Institute for Materials Research, Tohoku University.

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N2 - The concentration dependence of the order-disorder phase transformation temperature from the L2 1 to the B2 phase (T t L21/B2) and magnetic properties of Co 2Fe(Ga 1-xSi x) and Co 2Fe(Al 1-ySi y) Heusler alloys were investigated. In the phase diagrams, a crossover of the Curie temperature (T C) and T t L21/B2 was confirmed at around y 0.45 in Co 2Fe(Al 1-ySi y), whereas the T C and T t L21/B2 monotonically changed with x in Co 2Fe (Ga 1-xSi x). The slopes of the linear concentration dependence of T t L21/B2 for Co 2Fe(Al 1-ySi y) drastically changed at about y 0.45, suggesting that the chemical interchange energy between Fe and Al in Co 2FeAl alloy is affected by the magnetic ordering.

AB - The concentration dependence of the order-disorder phase transformation temperature from the L2 1 to the B2 phase (T t L21/B2) and magnetic properties of Co 2Fe(Ga 1-xSi x) and Co 2Fe(Al 1-ySi y) Heusler alloys were investigated. In the phase diagrams, a crossover of the Curie temperature (T C) and T t L21/B2 was confirmed at around y 0.45 in Co 2Fe(Al 1-ySi y), whereas the T C and T t L21/B2 monotonically changed with x in Co 2Fe (Ga 1-xSi x). The slopes of the linear concentration dependence of T t L21/B2 for Co 2Fe(Al 1-ySi y) drastically changed at about y 0.45, suggesting that the chemical interchange energy between Fe and Al in Co 2FeAl alloy is affected by the magnetic ordering.

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Magnetic and chemical order-disorder transformations in Co ₂Fe(Ga _1-xSi _x) and Co ₂Fe(Al _1-ySi _y) Heusler alloys

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