Depression of Curie temperature by surface structural phase transition

H. Y. Ho, Y. J. Chen, E. J. Hwang, S. K. Yu, C. S. Shern

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The comparative study in structural properties for the mirror systems, 1 ML Ni/1 ML CoPt (111) and 1 ML Co/1 ML NiPt (111) surface ordered alloys, reveals a structural phase transition from Nix Co1-x Pt to Nix Co1-x Pt3 ordered surface alloy when the annealing temperature is between 750 and 800 K. The Curie temperature speeds up to decrease when the surface structure changes from Nix Co1-x Pt to Nix Co1-x Pt3. The value of critical exponent Β near the Curie point crosses from a two-dimensional-like magnetic phase to a three-dimensional-like one after the phase transition. From the composition dependence of the Curie temperature, one can adjust the Curie temperatures of the surface alloy by controlling the annealing temperature.

Original languageEnglish
Article number142505
JournalApplied Physics Letters
Volume90
Issue number14
DOIs
Publication statusPublished - 2007 Apr 16

    Fingerprint

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this