Powder Metallurgy and Metal Ceramics

, Volume 55, Issue 1–2, pp 109–113 | Cite as

Effect of Copper on the Formation of Ordered L10(FePt) Phase in Nanosized Fe50Pt50/Cu/Fe50Pt50 Films on SiO2/Si (001) Substrates

  • T. I. Verbitskaya
  • E. V. Figurnaya
  • M. Yu. Verbitskaya
  • I. A. Vladymyrskyi
  • S. I. Sidorenko
  • E. P. Pavlova
  • Yu. N. Makogon
Article
  • 30 Downloads

The effect from thickness of an intermediate copper layer in nanosized Fe50Pt50 (15 nm)/Cu (x)/Fe50Pt50 (15 nm) (x = 7.5, 15, and 30 nm) composite films on SiO2 (100 nm)/Si(001) substrates on the diffusion-controlled phase formation processes—transformation of the disordered magnetically soft A1(FePt) phase into the ordered magnetically hard L10(FePt) phase during annealing in vacuum—is studied by physical materials science methods: X-ray diffraction and measurement of magnetic properties. The A1(FePt) phase forms in all films during deposition. Annealing in vacuum in the temperature range 300–900°C is accompanied by thermally activated diffusion processes between the Cu and FePt layers. When thickness of the intermediate Cu layer increases from 7.5 nm up to 15 nm, the onset temperature of A1(FePt) → L10(FePt) phase transformation raises by 100°C, i.e., to 800°C. Simultaneously, the coercivity in films decreases since Cu dissolves in the FePt lattice.

Keywords

ordered L10(FePt) phase annealing intermediate layer coercivity 

References

  1. 1.
    Mark H. Kryder, “Future storage technologies: a look beyond the horizon,” in: Proc. Symp. Computerworld’s Storage Networking World Conference (April 3–6, 2006, San Diego, California, USA), San Diego (2006), pp. 350–358.Google Scholar
  2. 2.
    M. Albrecht and C. Brombacher, “Rapid thermal annealing of FePt thin films,” Phys. Status Solidi A, 210, 1–10 (2013).CrossRefGoogle Scholar
  3. 3.
    O. P. Pavlova, T. I. Verbitska, I. A. Vladymyrskyi, et al., “Structural and magnetic properties of annealed FePt/Ag/FePt thin films,” Appl. Surf. Sci., 266, 100–104 (2013).CrossRefGoogle Scholar
  4. 4.
    Liwang Liu, Wei Sheng, Jianmin Bai, et al., “Magnetic properties and magnetization reversal process of L10FePt/Fe bilayers magnetic thin films,” Appl. Surf. Sci., 258, 8124–8127 (2012).Google Scholar
  5. 5.
    Utsumiya Kazutoshi, Seki Takeshi, and Takanashi Koki, “Magnetic properties of L10-FePt/permalloy exchange-spring films,” J. Appl. Phys., 110, 103911-1–4 (2011).Google Scholar
  6. 6.
    Y. S. Yu, Hai-Bo Li, W. L. Li, et al., “Low-temperature ordering of L10FePt phase in FePt thin film with AgCu underlayer,” J. Magn. Magn. Mater., 320, L125–L128 (2008).Google Scholar
  7. 7.
    Chun Feng, Qian Zhan, Baone Li, et al., “Magnetic properties and microstructure of FePt/Au multilayers with high perpendicular magnetocrystalline anisotropy,” Appl. Phys. Lett., 93, 152513-1–3 (2008).Google Scholar
  8. 8.
    B. Wang, K. Barmak, and T. J. Klemmer, “A1 to L10 transformation in FePt films with ternary alloying additions of Ag and Au,” IEEE Trans. Magn., 46, No. 6, 1773–1776 (2010).CrossRefGoogle Scholar
  9. 9.
    W. Y. Zhang, H. Shima, F. Takano, et al., “Enhancement in ordering of Fe50Pt50 film caused by Cr and Cu additives,” J. Appl. Phys., 106, 033907-1–4 (2009).Google Scholar
  10. 10.
    K. Barmak, J. Kim, L. H. Lewis, et al., “On the relationship of magnetocrystalline anisotropy and stoichiometry in epitaxial L10CoPt(001) and FePt(001) thin films,” J. Appl. Phys., 98, 033904-1–33 (2005).Google Scholar
  11. 11.
    A. C. Sun, F. T. Yuan, and Jen-Hwa Hsu, “Control of growth and ordering process in FePt(001) film at 300°C,” J. Phys. Conf. Ser., 200, 1020099-1–4 (2010).Google Scholar
  12. 12.
    Tomoyuki Maeda, Tadashi Kai, Akira Kikitsu, et al., “Reduction of ordering temperature of an FePt-ordered alloy by addition of Cu,” Appl. P hys. Lett., 80, No. 12, 2147–2149 (2011).Google Scholar

Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • T. I. Verbitskaya
    • 1
  • E. V. Figurnaya
    • 1
  • M. Yu. Verbitskaya
    • 1
  • I. A. Vladymyrskyi
    • 1
  • S. I. Sidorenko
    • 1
  • E. P. Pavlova
    • 1
  • Yu. N. Makogon
    • 1
  1. 1.National Technical University of Ukraine “Kyiv Polytechnic Institute”KievUkraine

Personalised recommendations