Helimagnetism and competition of exchange interactions in bulk giant magnetoresistance alloys based on Mn Au2

L. Udvardi, S. Khmelevskyi, L. Szunyogh, P. Mohn, P. Weinberger

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

By using the generalized perturbation method within the screened Korringa-Kohn-Rostoker formalism we calculate magnetic exchange interactions in the helimagnetic bulk Mn Au2 compound upon alloying Mn with Fe and Cr. The obtained interactions reproduce well the results of neutron diffraction experiments concerning the periodicity of the helix in Mn Au2 and its weakening with Fe substitution thus supporting the conventional interpretation of a metamagnet-ferromagnet transitions due to external fields. In the case of Mn1-x Crx Au2 alloys our results reveal that the experimentally observed magnetization process follows a completely different scenario, predicted theoretically a few decades ago for nearly orthogonal helimagnetics.

Original languageEnglish
Article number104446
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number10
DOIs
Publication statusPublished - Apr 7 2006

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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