Microstructure and spin polarization of quaternary Co2Cr1-xVxAl, Co2V1-xFexAl and Co2Cr1-xFexAl Heusler alloys

S. V. Karthik, A. Rajanikanth, Y. K. Takahashi, T. Ohkubo, K. Hono*

*この研究の対応する著者

研究成果: Article査読

44 被引用数 (Scopus)

抄録

The microstructures, magnetic properties and spin polarization of quaternary Co2Cr1-xVxAl, Co2V1-xFexAl and Co2Cr1-xFexAl alloys were investigated. Phase separation into A2 and B2/L21 structure occurs in Co2CrAl and Co2Cr0.6Fe0.4Al, whereas Co2FeAl exhibits a single-phase B2 structure. The ordered L21 structure becomes more stable with increasing vanadium concentration (x ≥ 0.35). The saturation magnetization measured at 5 K for Co2Cr1-xVxAl alloy changes from 1.4 to 2.0 μB when x increases from 0.0 to 0.5 and then becomes 1.4 μB for x = 1.0. This behavior can be attributed to the variation in the local magnetic moment of Co atoms. The saturation magnetization of Co2V1-xFexAl and Co2Cr1-xFexAl alloys increases with increasing Fe concentration. The spin polarization decreases from 0.62 to 0.56 with increasing x for Co2Cr1-xFexAl alloy. Also, the spin polarization decreases with increasing x for Co2Fe1-xVxAl and Co2Cr1-xVxAl alloys. Possible reasons for the reduced spin polarization in these alloys are discussed.

本文言語English
ページ(範囲)3867-3874
ページ数8
ジャーナルActa Materialia
55
11
DOI
出版ステータスPublished - 2007 6
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • ポリマーおよびプラスチック
  • 金属および合金

フィンガープリント

「Microstructure and spin polarization of quaternary Co<sub>2</sub>Cr<sub>1-x</sub>V<sub>x</sub>Al, Co<sub>2</sub>V<sub>1-x</sub>Fe<sub>x</sub>Al and Co<sub>2</sub>Cr<sub>1-x</sub>Fe<sub>x</sub>Al Heusler alloys」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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