Ferromagnetism of (ScCa)Co2 Laves phase compound synthesized under high pressure

M. Ohta, M. Okada, H. Kakuta, A. Fujita, K. Fukamichi, A. Kamegawa, H. Takamura

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

The appearance of ferromagnetism in (Sc0.85Ca 0.15)Co2 Laves phase synthesized under high pressure of 6 GPa was confirmed. A magnetically homogeneous state was achieved by applying pressure of 6 GPa in 1373 K for 48 h. This is the first study that confirmed a stable ferromagnetic state in exchange-enhanced Pauli paramagnet ScCo 2-based compound system. The quantities of pressure P and magnetization M dependence of the Curie temperature TC, dln T C/dP and (dln TC/dP)/(dln M/dP) = dln TC/dln M for (Sc0.85Ca0.15)Co2 are smaller than those for Lu(Co1 - xAlx)2 compounds, and accordingly the magnetic moment of (Sc0.85Ca0.15)Co2 is stiffer against pressure. The ratio of the spin wave stiffness constant D s to TC, Ds/TC, in (Sc 0.85Ca0.15)Co2 is smaller than that of Lu(Co1 - xAlx)2, implying that the spin wave in (Sc0.85Ca0.15)Co2 spread over wider wavevector space.

Original languageEnglish
Pages (from-to)147-150
Number of pages4
JournalJournal of Alloys and Compounds
Volume408-412
DOIs
Publication statusPublished - 2006 Feb 9
EventProceedings of the Rare Earths'04 in Nara, Japan -
Duration: 2004 Nov 72004 Nov 12

Keywords

  • Band magnetism
  • High-pressure synthesis
  • Pressure effect
  • Spin wave

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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