Evidence of local moment formation in Co-based Heusler alloys

N. D. Telling, P. S. Keatley, G. Van Der Laan, R. J. Hicken, E. Arenholz, Y. Sakuraba, M. Oogane, Y. Ando, K. Takanashi, A. Sakuma, T. Miyazaki

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42 Citations (Scopus)

Abstract

We examine the formation of local moments in Heusler alloys of the composition Co2MnZ (where Z=Si or Al) using the combined techniques of x-ray magnetic circular and linear dichroism. The existence of local moments in half-metallic Heusler alloys is reliant upon the band gap in the minority-spin states. By utilizing the element-specific nature of x-ray absorption techniques we are able to explore the degree of localization of moments on Co and Mn atoms. We observe a crucial difference in the localization of the Co moment when comparing Co2MnSi (CMS) and Co2MnAl films that is consistent with the predicted larger minority-spin gap in the Co partial density of states for CMS. These results provide important evidence for the dominant role of the Co minority-spin states in realizing half-metallic ferromagnetism in this system.

Original languageEnglish
Article number184438
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number18
DOIs
Publication statusPublished - 2008 Nov 25

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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