Spin wave-stiffness constants of half-metallic ferromagnets Co 2YZ (Y=Cr, Mn, and Fe, Z=Ga, Al, and Si) Heusler alloys

Rie Y. Umetsu, Akinari Okubo, Asaya Fujita, Takeshi Kanomata, Kiyohito Ishida, Ryosuke Kainuma

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The spin-wave stiffness constant D and the Curie temperature TC for series of L21 phase in Co2CrGa, Co2MnGa, Co2Mn(Al1-xSix) , Co2Fe(Al 1-xSix), and Co2Fe(Ga1-xSi x) Heusler alloys were evaluated from the thermomagnetization measurements. For the Co2CrGa, Co2MnGa, and Co 2Mn(Al1-xSix) alloys, there was a linear relation between D and TC. The tendency between D and TC was different from that for Co2Fe(Al1-xSix) and Co2Fe(Ga1-xSix) alloys, that is, TC was in the temperature region from 1040 to 1100 K indicating weak concentration dependence, whereas D was sensitive to the composition. For example, D changed from 2.28 meV · nm2 for x=1 (Co2FeSi) to 5.24 meV · nm2 for x=0 (Co2FeGa) in the case of Co 2Fe(Ga1-xSix) alloys. It was suggested that magnetic stability against the temperature of the Co-based Heusler alloys containing Fe element was governed not only by the spin-wave excitation but also by the other kinds of excitation.

Original languageEnglish
Article number6028176
Pages (from-to)2451-2454
Number of pages4
JournalIEEE Transactions on Magnetics
Volume47
Issue number10
DOIs
Publication statusPublished - 2011 Oct 1

Keywords

  • Co-based Heusler alloys
  • Curie temperature
  • half-metal-type ferromagnets
  • magnetic stability
  • spin-wave stiffness constant

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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