Preparation and magnetic properties of CoPt and CoPt:Ag nanocluster films

Y. Xu, Z. G. Sun, Y. Qiang, David J Sellmyer

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

CoPt and CoPt:Ag nanocluster films have been prepared using a sputtering gas-aggregation cluster source. The cluster size can be controlled in a range from 3 to 8nm. CoPt cluster films are directly deposited onto Si or 7059 glass substrates. CoPt:Ag cluster films are deposited by co-sputtering or by a CoPt cluster layer with a Ag underlayer and an overlayer. Crystal structure, nanostructure and magnetic properties of the samples were characterized by X-ray diffraction, transmission electron microscopy, and magnetometry. The as-deposited cluster films contain the magnetically soft disordered FCC CoPt phase. Tetragonal L10 ordering is realized in the films annealed at a temperature above 650°C. The orientation of clusters is generally 〈111〉. The coercivity increases with increase of annealing temperature and annealing time, and very high in-plane and out-of-plane coercivities have been achieved in both CoPt and CoPt:Ag cluster films after annealing at a temperature of 700°C for 10min. The effect of Ag addition on the CoPt:Ag cluster films and the atomic ordering process in these films, and their relations to the hard magnetic properties, is discussed. The preparation of cluster films may provide a new method for fabrication of extremely high-density magnetic recording media.

Original languageEnglish (US)
Pages (from-to)164-170
Number of pages7
JournalJournal of Magnetism and Magnetic Materials
Volume266
Issue number1-2
DOIs
StatePublished - Oct 1 2003

Fingerprint

Nanoclusters
nanoclusters
Magnetic properties
magnetic properties
preparation
Annealing
Coercive force
Sputtering
annealing
coercivity
sputtering
Magnetic recording
magnetic recording
Temperature
Nanostructures
magnetic measurement
temperature
Agglomeration
Crystal structure
Gases

Keywords

  • Cluster film
  • CoPt
  • High coercivity
  • L1 ordering
  • Nanocluster

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Preparation and magnetic properties of CoPt and CoPt:Ag nanocluster films. / Xu, Y.; Sun, Z. G.; Qiang, Y.; Sellmyer, David J.

In: Journal of Magnetism and Magnetic Materials, Vol. 266, No. 1-2, 01.10.2003, p. 164-170.

Research output: Contribution to journalArticle

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