Exchange Enhancement of Pd Coating on Ni Fine Particles

Takashi Manago, Hideki Miyajima, Yoshichika Otani, Etsuo Akiba

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Magnetic and structural properties of Ni fine particles (0.7±0.2 μm in diameter) coated with Pd (5 nm∼37 nm in thickness) were investigated in a hydrogen atmosphere by means of magnetometry and X-ray diffractometry. The spontaneous magnetic moment is newly induced on the Pd atoms even at room temperature by the magnetic proximity effect between Ni core and Pd layer. Relatively large coercive force indicates the presence of the interface anisotropy. The magnetic polarization and the coercive force are suppressed by the hydrogenation. The temperature dependence of the magnetization shows a broad maximum around 80 K and an increase below 50 K. The maximum in magnetization is due to the enhanced paramagnetic contribution of Pd, and the gradual increase below 50 K is due to the Ni moment in contact with ferromagnetic Pd. A model for layered magnetic structure of the Ni particles coated with Pd is proposed.

Original languageEnglish
Pages (from-to)831-838
Number of pages8
Journaljournal of the physical society of japan
Volume66
Issue number3
DOIs
Publication statusPublished - Mar 1997

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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