Depression of Curie temperature by surface structural phase transition

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

doi:10.1063/1.2719630

Depression of Curie temperature by surface structural phase transition

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

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Article › peer-review

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 language	English
Article number	142505
Journal	Applied Physics Letters
Volume	90
Issue number	14
DOIs	https://doi.org/10.1063/1.2719630
Publication status	Published - 2007

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.2719630

Cite this

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title = "Depression of Curie temperature by surface structural phase transition",

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.",

author = "Ho, {H. Y.} and Chen, {Y. J.} and Hwang, {E. J.} and Yu, {S. K.} and Shern, {C. S.}",

note = "Funding Information: This work was supported by the National Science Council of Taiwan of the Republic of China under the Grant No. NSC 95-2112-M-003-016. ",

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doi = "10.1063/1.2719630",

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T1 - Depression of Curie temperature by surface structural phase transition

AU - Ho, H. Y.

AU - Chen, Y. J.

AU - Hwang, E. J.

AU - Yu, S. K.

AU - Shern, C. S.

N1 - Funding Information: This work was supported by the National Science Council of Taiwan of the Republic of China under the Grant No. NSC 95-2112-M-003-016.

PY - 2007

Y1 - 2007

N2 - 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.

AB - 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.

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Depression of Curie temperature by surface structural phase transition

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