Rapid ordering of Zr-doped FePt alloy films

Seong Rae Lee; Sanghyun Yang; Young Keun Kim; Jong Gab Na

doi:10.1063/1.1379591

Rapid ordering of Zr-doped FePt alloy films

Seong Rae Lee, Sanghyun Yang, Young Keun Kim, Jong Gab Na

Department of Materials Science and Engineering

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

66 Citations (Scopus)

Abstract

The magnetic properties and microstructural evolution of Zr-doped FePt alloy films prepared by dc-magnetron sputtering were investigated. Compared to an undoped Fe₅₉Pt₄₁ binary film, Zr-doped FePt alloy films showed accelerated ordering transformation kinetics accompanying smaller grains: we were able to fabricate a Zr-doped FePt film [e.g., (Fe₅₉Pt₄₁)₉₇Zr₃] possessing very fine grain size (5 nm in average) and high coercivity (7.3 kOe) within 10 min annealing at 500 °C. It is thought that the point defects and lattice strain introduced by Zr-doping activated the nucleation rate of the ordered phase. In particular, for Zr-doped FePt films containing less than 45 at. % Pt, the ordered L1₀ phase was decomposed into a disordered phase after excessive annealing due to the formation of a Pt-Zr compound, most likely Pt₃Zr, that reduces the effective Pt content in the ordered phase.

Original language	English
Pages (from-to)	4001-4003
Number of pages	3
Journal	Applied Physics Letters
Volume	78
Issue number	25
DOIs	https://doi.org/10.1063/1.1379591
Publication status	Published - 2001 Jun 18

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Rapid ordering of Zr-doped FePt alloy films",

abstract = "The magnetic properties and microstructural evolution of Zr-doped FePt alloy films prepared by dc-magnetron sputtering were investigated. Compared to an undoped Fe59Pt41 binary film, Zr-doped FePt alloy films showed accelerated ordering transformation kinetics accompanying smaller grains: we were able to fabricate a Zr-doped FePt film [e.g., (Fe59Pt41)97Zr3] possessing very fine grain size (5 nm in average) and high coercivity (7.3 kOe) within 10 min annealing at 500 °C. It is thought that the point defects and lattice strain introduced by Zr-doping activated the nucleation rate of the ordered phase. In particular, for Zr-doped FePt films containing less than 45 at. % Pt, the ordered L10 phase was decomposed into a disordered phase after excessive annealing due to the formation of a Pt-Zr compound, most likely Pt3Zr, that reduces the effective Pt content in the ordered phase.",

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AU - Lee, Seong Rae

AU - Yang, Sanghyun

AU - Kim, Young Keun

AU - Na, Jong Gab

PY - 2001/6/18

Y1 - 2001/6/18

N2 - The magnetic properties and microstructural evolution of Zr-doped FePt alloy films prepared by dc-magnetron sputtering were investigated. Compared to an undoped Fe59Pt41 binary film, Zr-doped FePt alloy films showed accelerated ordering transformation kinetics accompanying smaller grains: we were able to fabricate a Zr-doped FePt film [e.g., (Fe59Pt41)97Zr3] possessing very fine grain size (5 nm in average) and high coercivity (7.3 kOe) within 10 min annealing at 500 °C. It is thought that the point defects and lattice strain introduced by Zr-doping activated the nucleation rate of the ordered phase. In particular, for Zr-doped FePt films containing less than 45 at. % Pt, the ordered L10 phase was decomposed into a disordered phase after excessive annealing due to the formation of a Pt-Zr compound, most likely Pt3Zr, that reduces the effective Pt content in the ordered phase.

AB - The magnetic properties and microstructural evolution of Zr-doped FePt alloy films prepared by dc-magnetron sputtering were investigated. Compared to an undoped Fe59Pt41 binary film, Zr-doped FePt alloy films showed accelerated ordering transformation kinetics accompanying smaller grains: we were able to fabricate a Zr-doped FePt film [e.g., (Fe59Pt41)97Zr3] possessing very fine grain size (5 nm in average) and high coercivity (7.3 kOe) within 10 min annealing at 500 °C. It is thought that the point defects and lattice strain introduced by Zr-doping activated the nucleation rate of the ordered phase. In particular, for Zr-doped FePt films containing less than 45 at. % Pt, the ordered L10 phase was decomposed into a disordered phase after excessive annealing due to the formation of a Pt-Zr compound, most likely Pt3Zr, that reduces the effective Pt content in the ordered phase.

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Rapid ordering of Zr-doped FePt alloy films

Abstract

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