Texture development and magnetic properties of Ru-doped FePt films

ORAL

Abstract

L1$_{0}$ ordered FePt films are promising candidates for ultra-high density recording media due to their high magneto-crystalline anisotropy when grown with (001) texture. In this paper, the effects of Ru doping on the FePt L1$_{0}$ phase formation and development of (001) texture are studied systematically. Ru doping is realized by preparing Fe/Pt/Ru multilayers by magnetron sputtering on SiO$_{2}$ substrates, with subsequent annealing at 650 $^{o}$C for 5 minutes in forming gas or hydrogen gas. It appears that hydrogen gas annealing leads to improved (001) texture. For small Ru alloying (less than 5 at. {\%}), the L1$_{0}$ texture and degree of chemical ordering remain the same. X-ray diffraction analysis shows that the (001) and (002) peaks shift slightly to larger angles, indicating that the Ru is dissolved in the FePt L1$_{0}$ phase. Increasing the Ru concentration beyond 5 at. {\%} resulted in an increasing (111) texture and a steady decrease of both coercivity and saturation magnetization. The effects of Ru on the magnetization and the magnitude of the coercivity have been studied. The mechanism by which Ru doping influences the texture development also will be presented in this work.

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Authors

  • Zhen Li

    Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588-0111

  • Yucheng Sui

    Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE, 68588-0111, USA, Department of Physics and Astronomy and NCMN, University of Nebraska, Lincoln, NE, 68588-0113, Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588-0111, Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588 USA

  • Roger Kirby

    Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588-0111

  • David Sellmyer

    Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588-0111