Magnetic Properties of Cluster/Thin-Film Laminated Hybrids of Fe–Pt and Fe–Co Alloys

Abstract

Both FePt cluster/FeCo film and FeCo cluster/FePt film laminated hybrids have been prepared by combination of a plasma-gascluster-deposition and a helicon-plasma sputter-deposition and studied by X-ray diffraction and magnetization measurements. In FePt cluster/ FeCo film laminated hybrids, M S increases, while H C and BH MAX monotonically decrease with the FeCo film thickness. In FeCo cluster/Fe Pt film laminated hybrids, M S , H C and BH MAX increase with the FeCo cluster layer thickness in comparison with those of simple FePt films. However, the remarkable improvement of their hard magnetic properties cannot be attained in these laminated hybrids owing to both the low packing density of FeCo clusters and the difficulty in the diffusion-control of Fe and Co atoms from FeCo to FePt layers.

Electrically conductive properties of Ag/Si composite nanoparticle assembled films prepared with a plasma–gas-condensation cluster source

“…1) Using a plasma-gas-condensation cluster beam deposition (PGCCD) apparatus, [2][3][4][5] we can obtain metal nanoparticles by setting targets [5][6][7][8] and alloy nanoparticles by setting two different metal targets face to face. 9,10) Recently, we have succeeded in producing composite nanoparticles consisting of two elements, for example, Fe/Si, 11,12) Co/Si, 13) and Fe/Al 14) core-shell nanoparticles, using a double-source PGCCD apparatus, and Co/CoO 15) core-shell and Sn/Si bimetallic nanoparticles, using a single-source PGCCD apparatus. 16) The nanocomposite films have attracted much attention owing to these valuable properties.…”