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Journal of Nanomaterials
Volume 2017, Article ID 3075945, 5 pages
https://doi.org/10.1155/2017/3075945
Research Article

Synthesis of a High-Coercivity FePt–Ag Nanocomposite Magnet via Block Copolymer-Templated Self-Assembly

Toyota Central R&D Laboratories, Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan

Correspondence should be addressed to Hiroaki Wakayama; pj.oc.sbaltyt.ksom@amayakaw

Received 30 June 2017; Revised 28 September 2017; Accepted 30 October 2017; Published 15 November 2017

Academic Editor: Jean M. Greneche

Copyright © 2017 Hiroaki Wakayama and Hirotaka Yonekura. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Linked References

  1. G. Varvaro and F. Casoli, Ultra-High-density magnetic recording: Storage Materials and Media Designs, Pan Stanford, London, UK, 2016. View at Publisher · View at Google Scholar
  2. E. Jafari-Khamse, M. Almasi-Kashi, A. Ramazani, and H. Almasi-Kashi, “The effect of the thickness ratio of magnetic layers on the microstructure and magnetic properties of (CoCrPt)97.5Nb2.5/Co75Cr13Pt12/Cr thin films,” The European Physical Journal Plus, vol. 129, no. 12, article no. 276, 2014. View at Publisher · View at Google Scholar · View at Scopus
  3. B. Bhushan, Tribology and Mechanics of Magnetic Storage Devices, Springer New York, New York, NY, 1996. View at Publisher · View at Google Scholar
  4. D. Weller and A. Moser, “Thermal effect limits in ultrahigh-density magnetic recording,” IEEE Transactions on Magnetics, vol. 35, no. 6, pp. 4423–4439, 1999. View at Publisher · View at Google Scholar · View at Scopus
  5. D. Weller, A. Moser, L. Folks et al., “High Ku materials approach to 100 Gbits/in2,” IEEE Transactions on Magnetics, vol. 36, no. 1, pp. 10–15, 2000. View at Publisher · View at Google Scholar
  6. D. Weller, G. Parker, O. Mosendz et al., “Review Article: FePt heat assisted magnetic recording media,” Journal of Vacuum Science & Technology B, vol. 34, no. 6, Article ID 060801, 2016. View at Publisher · View at Google Scholar · View at Scopus
  7. R. O. Topaloglu, More than Moore Technologies for Next Generation Computer Design, Springer, New York, NY, USA, 2015. View at Scopus
  8. B. K. Chatterjee, K. Bhattacharjee, A. Dey, C. K. Ghosh, and K. K. Chattopadhyay, “Influence of spherical assembly of copper ferrite nanoparticles on magnetic properties: Orientation of magnetic easy axis,” Dalton Transactions, vol. 43, no. 21, pp. 7930–7944, 2014. View at Publisher · View at Google Scholar · View at Scopus
  9. W. F. Brown, “Thermal fluctuations of a single-domain particle,” Physical Review A: Atomic, Molecular and Optical Physics, vol. 130, no. 5, pp. 1677–1686, 1963. View at Publisher · View at Google Scholar · View at Scopus
  10. K. Trohidou, Magnetic Nanoparticle Assemblies, Pan Stanford, 2014. View at Publisher · View at Google Scholar
  11. R. Sbiaa, H. Meng, and S. N. Piramanayagam, “Materials with perpendicular magnetic anisotropy for magnetic random access memory,” Physica Status Solidi – Rapid Research Letters, vol. 5, no. 12, pp. 413–419, 2011. View at Publisher · View at Google Scholar
  12. O. A. Ivanov, L. V. Solina, V. A. Demshina, and L. M. Magat, “Determination of the anisotropy constant and saturation magnetization, and magnetic properties of powders of an iron-platinum alloy,” The Physics of Metals and Metallography, vol. 35, no. 1, pp. 81–85, 1973. View at Google Scholar · View at Scopus
  13. S. H. Charap, P.-L. Lu, and Y. He, “Thermal stability of recorded information at high densities,” IEEE Transactions on Magnetics, vol. 33, no. 1, pp. 978–983, 1997. View at Publisher · View at Google Scholar · View at Scopus
  14. S. Mi, R. Liu, Y. Li, J. Ye, Y. Xie, and Z. Chen, “Effect of sputter pressure on magnetotransport properties of FePt nanocomposites,” Journal of Magnetism and Magnetic Materials, vol. 403, pp. 14–17, 2016. View at Publisher · View at Google Scholar · View at Scopus
  15. H. Wang, H. Zhao, T. Rahman et al., “Fabrication and characterization of fept exchange coupled composite and graded bit patterned media,” IEEE Transactions on Magnetics, vol. 49, no. 2, pp. 707–712, 2013. View at Publisher · View at Google Scholar · View at Scopus
  16. Y.-J. Chiu, C.-Y. Shen, S.-R. Jian et al., “Nanoindentation study of FePt thin films deposited by radio frequency magnetron sputtering,” Nanoscience and Nanotechnology Letters (NNL), vol. 8, no. 3, pp. 260–265, 2016. View at Publisher · View at Google Scholar · View at Scopus
  17. T. Hasegawa and K. Ito, “Structural Dependent Ferromagnetic-Nonmagnetic Phase Change in FePtRu Films,” Advances in Materials Science and Engineering, vol. 2017, pp. 1–7, 2017. View at Publisher · View at Google Scholar
  18. H. Pandey, A. Perumal, J. Wang, Y. K. Takahashi, and K. Hono, “Growth Mechanism of Columnar Grains in FePt-C Granular Films for HAMR Media Processed by Compositionally Graded Sputtering,” IEEE Transactions on Magnetics, vol. 52, no. 7, 2016. View at Publisher · View at Google Scholar · View at Scopus
  19. H. Wang, H. Wang, P. Shang et al., “One-step synthesis of high-coercivity L 10-FePtAg nanoparticles: Effects of Ag on the morphology and chemical ordering of FePt nanoparticles,” Chemistry of Materials, vol. 25, no. 12, pp. 2450–2454, 2013. View at Publisher · View at Google Scholar · View at Scopus
  20. Y. Yu, P. Mukherjee, Y. Tian, X.-Z. Li, J. E. Shield, and D. J. Sellmyer, “Direct chemical synthesis of L10-FePtAu nanoparticles with high coercivity,” Nanoscale, vol. 6, no. 20, pp. 12050–12055, 2014. View at Publisher · View at Google Scholar · View at Scopus
  21. S. Sun, C. B. Murray, D. Weller, L. Folks, and A. Moser, “Monodisperse FePt nanoparticles and ferromagnetic FePt nanocrystal superlattices,” Science, vol. 287, no. 5460, pp. 1989–1992, 2000. View at Publisher · View at Google Scholar
  22. S. S. Kang, D. E. Nikles, and J. W. Harrell, “Synthesis, chemical ordering, and magnetic properties of self-assembled FePt-Ag nanoparticles,” Journal of Applied Physics, vol. 93, no. 10, pp. 7178–7180, 2003. View at Publisher · View at Google Scholar · View at Scopus
  23. B.-H. Sohn, S.-I. Yoo, B.-W. Seo, S.-H. Yun, and S.-M. Park, “Nanopatterns by free-standing monolayer films of diblock copolymer micelles with in situ core - Corona inversion,” Journal of the American Chemical Society, vol. 123, no. 50, pp. 12734-12735, 2001. View at Publisher · View at Google Scholar · View at Scopus
  24. A. Horechyy, N. E. Zafeiropoulos, B. Nandan et al., “Highly ordered arrays of magnetic nanoparticles prepared via block copolymer assembly,” Journal of Materials Chemistry, vol. 20, no. 36, pp. 7734–7741, 2010. View at Publisher · View at Google Scholar · View at Scopus
  25. C. Burda, X. Chen, R. Narayanan, and M. A. El-Sayed, “Chemistry and properties of nanocrystals of different shapes,” Chemical Reviews, vol. 105, no. 4, pp. 1025–1102, 2005. View at Publisher · View at Google Scholar · View at Scopus
  26. No. 00-043-1359, JCPDS International Center for Diffraction Data, 2016.
  27. B. E. Warren, X-Ray Diffraction, Dover Books on Physics, Dover Books on Physics, New York, NY, USA, 1990.