Spin Stiffness Constant of Half-metallic Ferrimagnet in Mn-based Heusler Alloys

Rie Y. Umetsu, Takeshi Kanomata

Research output: Contribution to journalConference articlepeer-review

8 Citations (Scopus)

Abstract

In order to investigate the spin stiffness constant, D, of Mn-based Heusler alloys with half-metallic density of states, magnetic measurements were properly carried out. The Curie temperature, TC, of Mn2VAl, Mn50V20Al30 and Mn2CoGa were 768, 738 and 740 K, respectively. The value of D was evaluated from the temperature, T, dependence of the spontaneous magnetization in each specimen below 150 K, where linear dependence of T 3/2 was observed. The D values for these materials were obtained to be 5.34, 4.38 and 5.67 meV·(nm)2 and significantly larger than that for Co-based Heusler alloys reported previously. The strong exchange interaction would be the reason that the Mn-based Heusler alloys indicate high TC even though they have not so large total magnetic moment comparing to that of Co-based Heusler alloys.

Original languageEnglish
Pages (from-to)890-897
Number of pages8
JournalPhysics Procedia
Volume75
DOIs
Publication statusPublished - 2015
Event20th International Conference on Magnetism, ICM 2015 - Barcelona, Spain
Duration: 2015 Jul 52015 Jul 10

Keywords

  • exchange interaction
  • half-metal ferrimagnets
  • spin stiffness constant
  • spontaneous magnetization
  • the Curie temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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