Journal of the Korean Physical Society

, Volume 62, Issue 12, pp 1807–1811 | Cite as

Design of self-organized nanostructures to achieve high blocking temperatures in MgO-based d0 ferromagnets

  • Masayoshi Seike
  • Tetsuya Fukushima
  • Kazunori Sato
  • Hiroshi Katayama-Yoshida
Article

Abstract

We present a materials design of MgO-based d0 ferromagnets with a high blocking temperature (TB) based on multiscale simulations. The chemical pair interactions between the N atoms in Mg(O,N) and the Mg vacancies (VMg) in (Mg,VMg)O were calculated using a generalized gradient approximation, and Monte Carlo simulations of the crystal growth were performed to predict the configurations of the dopant distribution. Our simulations showed that self-organized nanostructures could be formed both in Mg(O,N) and (Mg,VMg)O, which suggests that a high TB can be obtained in these d0 ferromagnets due to the superparamagnetic blocking phenomenon. Furthermore, depending on the crystal growth conditions, it was shown that various self-organized nanostructures, such as three-dimensional nanoclusters and one-dimensional nanowires, could appear.

Keywords

Self-organization Superparamagnetism d0 ferromagnetism First-principles calculation Monte Carlo simulation Magnesium oxide 

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Copyright information

© The Korean Physical Society 2013

Authors and Affiliations

  • Masayoshi Seike
    • 1
  • Tetsuya Fukushima
    • 1
  • Kazunori Sato
    • 1
  • Hiroshi Katayama-Yoshida
    • 1
  1. 1.Graduate School of Engineering ScienceOsaka UniversityToyonakaJapan

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