Magnetic reversal study of Au-FePt thin films with very high coercivity

F. T. Yuan, S. K. Chen, Lance Horng, J. L. Tsai

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Magnetic reversal behaviors of Au (60 nm)-FePt (x nm) thin films with various x values are investigated. A high temperature heat treatment at 800°C was applied to obtain an isolated microstructure with L10 FePt particles embedded in a face-centered cubic gold matrix through interfacial diffusion. The coercivity of the thin films was increased from 13.6 kOe to a maximum value of 30.0 kOe as the thickness of the FePt layer was decreased from 200 to 10 nm. From the dc demagnetization and isothermal remanence magnetization measurements, we found that the bilayer sample with x = 10 exhibits larger reversible magnetization. The coercive mechanism was found to be controlled by the magnetization rotation of the isolated FePt particles. As x is increased, the reversal behavior is changed into a domain-wall motion mode gradually. The magnetic force microscopy investigations further confirm the change of mechanism. The domain-wall motion appears to result from the formation of large multidomain grains. Considering the relation of reversal behavior and the coercivity, we thus conclude that the removal of domain walls is beneficial for hard magnetic performance.

Original languageEnglish
Pages (from-to)3346-3348
Number of pages3
JournalIEEE Transactions on Magnetics
Volume41
Issue number10
DOIs
Publication statusPublished - 2005 Oct 1

Fingerprint

Domain walls
Coercive force
coercivity
domain wall
Magnetization
Thin films
magnetization
thin films
Magnetic force microscopy
Demagnetization
Remanence
magnetic force microscopy
demagnetization
remanence
Gold
heat treatment
Heat treatment
gold
microstructure
Microstructure

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

Yuan, F. T. ; Chen, S. K. ; Horng, Lance ; Tsai, J. L. / Magnetic reversal study of Au-FePt thin films with very high coercivity. In: IEEE Transactions on Magnetics. 2005 ; Vol. 41, No. 10. pp. 3346-3348.
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Magnetic reversal study of Au-FePt thin films with very high coercivity. / Yuan, F. T.; Chen, S. K.; Horng, Lance; Tsai, J. L.

In: IEEE Transactions on Magnetics, Vol. 41, No. 10, 01.10.2005, p. 3346-3348.

Research output: Contribution to journalArticle

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