Spin-glass behaviour, thermal expansion anomaly and spin fluctuations in Y20(Mn1-xFex)80 amorphous alloys

M. Ohta, Asaya Fujita, K. Fukamichi, Y. Obi, H. Fujimori

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7 Citations (Scopus)

Abstract

The spin-glass behaviour and the thermal expansion anomaly in annealed Y20(Mn1-xFex)80 amorphous alloys have been investigated. The spin freezing temperature Tg shows a minimum at around x = 0.50, consistent with the theoretical investigation. The sign of the paramagnetic Curie temperature θp indicates that the average exchange interaction is antiferromagnetic in the Mn-rich concentration region and gradually becomes ferromagnetic with increasing x. The minimum of Tg occurs at the concentration where the sign of θp changes. The spontaneous volume magnetostriction is negligibly small in the Mn-rich concentration region and becomes larger with increasing x. These results are explained by the change in the spin fluctuation characteristics. In the Fe-rich concentration region, the thermal expansion anomaly takes place even in the paramagnetic temperature range due to the single-site spin fluctuation.

Original languageEnglish
Pages (from-to)4053-4062
Number of pages10
JournalJournal of Physics Condensed Matter
Volume11
Issue number20
DOIs
Publication statusPublished - 1999 May 24

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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