Hydrogenation effect on magnetic properties of Pd–Co alloys

Satoshi Akamaru*, Akihiro Kimura, Masanori Hara, Katsuhiko Nishimura, Takayuki Abe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The magnetic properties of Pd–Co alloys and their hydrides were investigated. From the temperature dependences of magnetization of Pd–Co alloys, simple ferromagnetic behaviors were observed, and the Curie temperatures are estimated to be 220, 315, and 350 K for Pd 0.96 Co 0.04 , Pd 0.92 Co 0.08 , and Pd 0.90 Co 0.10 , respectively. The Pd–Co alloys were hydrogenated under 100 kPa hydrogen gas pressure. After hydrogenation, the temperature variations of magnetization revealed two magnetic transitions implying that there are two phases in the hydrogenated Pd–Co: the hydrogen dissolution and hydride phases. The hydrogen contents ([H]/[Pd–Co]) and the Curie temperature (T C ) of the hydride phase are deduced that [H]/[Pd–Co] = 0.53, 0.43 and 0.36 with T C = ≤50, 100 and 120 K for Pd 0.96 Co 0.04 , Pd 0.92 Co 0.08 , and Pd 0.90 Co 0.10 hydrides, respectively. The magnetization against externally applied field measured at 50 and 300 K indicated that the magnetic moments per a single ion (Pd, Co) of the hydrides are always smaller than those of the original Pd–Co alloys. First principle calculations for the magnetic moments provided quite consistent results with the experimental ones.

Original languageEnglish
Pages (from-to)8-13
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume484
DOIs
StatePublished - 2019/08/15

Keywords

  • Band structure calculation
  • Hydrogen
  • Magnetic property
  • Pd–Co

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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