Contribution of Pt impurities to spin configurations in the reentrant spin glass NiMn

T. Ando, E. Ohta, T. Sato

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We have measured the temperature-dependent linear and nonlinear susceptibilities of the reentrant spin glass Ni100-xMnx (x = 22.4, 23.0 and 23.4) and Pt-doped samples Ni100-x-yPtyMnx (x = 23.5, y = 0.6 and 1.1) in order to elucidate the thermal evolution of spin configurations in the low-temperature states. The nonlinear susceptibility in the reentrant spin glasses Ni77.0Mn23.0 and Ni76.6Mn23.4 shows a peak corresponding to the appearance of the vortex-like spin structure in addition to conventional phase transitions. Such an extra peak becomes more pronounced in Ni75.9Pt0.6Mn23.5 and Ni75.4Pt1.1Mn23.5 with increasing Pt content, suggesting the appearance of a long-range vortical spin arrangement above the spin freezing temperature. In these Pt-doped samples, the singularity due to the spin glass transition becomes indistinct and the ferromagnetic transition disappears. We explain this contribution of Pt to the spin configuration in terms of the enhanced magnetic anisotropy due to a Dzyaloshinsky-Moriya-type interaction.

Original languageEnglish
Pages (from-to)277-284
Number of pages8
JournalJournal of Magnetism and Magnetic Materials
Volume163
Issue number3
DOIs
Publication statusPublished - 1996 Nov 1

Keywords

  • Magnetic anisotropy
  • NiMn
  • Nonlinear susceptibility
  • Reentrant spin glass
  • Vortex spin structure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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