Temperature dependence of site-resolved Fe magnetic moments in ThMn12-type Sm(Fe1−xCox)12 compounds studied via synchrotron Mössbauer spectroscopy

D. Ogawa, T. Fukazawa, S. Li, T. Ueno, S. Sakai, T. Mitsui, T. Miyake, S. Okamoto, S. Hirosawa, Y. K. Takahashi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The relationship between the magnetization and magnetic moment at each Fe site in Sm(Fe1−xCox)12 compounds and their temperature dependence were investigated via synchrotron Mössbauer spectroscopy. The enhancement in the Fe magnetic moments in the Sm(Fe1−xCox)12 compounds with increasing Co content was observed at a similar rate as the increment in their saturation magnetization at 300 K. We found that the magnitudes of the Fe magnetic moments vary in a descending order: 8i > 8j > 8f, and they are independent of the Co content because the variation is caused by the magneto-volume effect. The curvatures of the temperature dependence of the Fe-sublattice magnetic moments are larger and also vary in the order of 8i > 8j > 8f because the enhancements in the exchange coupling strength decrease in the same order.

Original languageEnglish
Article number169188
JournalJournal of Magnetism and Magnetic Materials
Volume552
DOIs
Publication statusPublished - 2022 Jun 15
Externally publishedYes

Keywords

  • Magnetic moment of Fe
  • Sm(Fe-Co) compound
  • Synchrotron Mössbauer spectroscopy
  • Temperature dependence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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