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

T. Ando, E. Ohta, T. Sato

研究成果: Article査読

17 被引用数 (Scopus)


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.

ジャーナルJournal of Magnetism and Magnetic Materials
出版ステータスPublished - 1996 11月

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学


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