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The microstructural evolution of chemical disorder and ferromagnetism in He+irradiated FePt3films

Journal Article


Abstract


  • This paper investigates the role of ion-induced disorder on the morphology and magnetic properties of chemically ordered FePt3films. The effects are studied for 15 keV He+ions as a function of the ion fluence for 0, 2 × 1016and 2 × 1017ions cm−2. Substitutional mixing of the L12-type Fe-Pt sites takes place within the region of the chemically ordered FePt3film affected by the irradiation. This accompanies a paramagnetic-to-ferromagnetic transition, as determined by room-temperature magnetometry. Dark-field transmission electron microscopy (TEM) measurements confirm that the 15 keV He+ions induce a 120 nm-thick chemically disordered layer into the sub-surface region of the nominally 280 nm-thick ordered FePt3film. The average domain size and the fractional density of the chemically ordered domains within the irradiated FePt3microstructure are found to mutually decrease with increasing ion fluence. Selected-area electron diffraction results demonstrate that the film's single crystallinity is preserved after irradiation, irrespective of the ion fluence. High-resolution TEM elucidates the coexistence of ordered domains and precipitate disordered domains in the near-surface, low-ion impacted regions of the FePt3film. Collectively, this work provides detailed insights into the material-science relationship between ion-induced disorder and ferromagnetism in FePt3, as a step towards creating fully customisable, ion-beam-synthesised magnetic nano-elements.

Authors


  •   Causer, Grace (external author)
  •   Zhu, Hanliang (external author)
  •   Davis, Joel P. (external author)
  •   Ionescu, Mihail (external author)
  •   Mankey, Gary (external author)
  •   Wang, Xiaolin
  •   Klose, Frank (external author)

Publication Date


  • 2018

Citation


  • Causer, G. L., Zhu, H., Davis, J., Ionescu, M., Mankey, G. J., Wang, X. L. & Klose, F. (2018). The microstructural evolution of chemical disorder and ferromagnetism in He+irradiated FePt3films. Applied Surface Science, 459 672-677.

Scopus Eid


  • 2-s2.0-85051131935

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3226

Number Of Pages


  • 5

Start Page


  • 672

End Page


  • 677

Volume


  • 459

Place Of Publication


  • Netherlands

Abstract


  • This paper investigates the role of ion-induced disorder on the morphology and magnetic properties of chemically ordered FePt3films. The effects are studied for 15 keV He+ions as a function of the ion fluence for 0, 2 × 1016and 2 × 1017ions cm−2. Substitutional mixing of the L12-type Fe-Pt sites takes place within the region of the chemically ordered FePt3film affected by the irradiation. This accompanies a paramagnetic-to-ferromagnetic transition, as determined by room-temperature magnetometry. Dark-field transmission electron microscopy (TEM) measurements confirm that the 15 keV He+ions induce a 120 nm-thick chemically disordered layer into the sub-surface region of the nominally 280 nm-thick ordered FePt3film. The average domain size and the fractional density of the chemically ordered domains within the irradiated FePt3microstructure are found to mutually decrease with increasing ion fluence. Selected-area electron diffraction results demonstrate that the film's single crystallinity is preserved after irradiation, irrespective of the ion fluence. High-resolution TEM elucidates the coexistence of ordered domains and precipitate disordered domains in the near-surface, low-ion impacted regions of the FePt3film. Collectively, this work provides detailed insights into the material-science relationship between ion-induced disorder and ferromagnetism in FePt3, as a step towards creating fully customisable, ion-beam-synthesised magnetic nano-elements.

Authors


  •   Causer, Grace (external author)
  •   Zhu, Hanliang (external author)
  •   Davis, Joel P. (external author)
  •   Ionescu, Mihail (external author)
  •   Mankey, Gary (external author)
  •   Wang, Xiaolin
  •   Klose, Frank (external author)

Publication Date


  • 2018

Citation


  • Causer, G. L., Zhu, H., Davis, J., Ionescu, M., Mankey, G. J., Wang, X. L. & Klose, F. (2018). The microstructural evolution of chemical disorder and ferromagnetism in He+irradiated FePt3films. Applied Surface Science, 459 672-677.

Scopus Eid


  • 2-s2.0-85051131935

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3226

Number Of Pages


  • 5

Start Page


  • 672

End Page


  • 677

Volume


  • 459

Place Of Publication


  • Netherlands