THE SPIN REORIENTATION AND THE MAGNETI ANISOTROPY IN $R_{2}Fe_{17-x}M_{x}C_{y}$ (R=Er, Tm, M=Al, Ga)

  • Ohno, K. (Dept. of Physics, Faculty of Science, Toho Univ.) ;
  • Urakabe, T. (Dept. of Physics, Faculty of Science, Toho Univ.) ;
  • Agata, M. (Dept. of Physics, Faculty of Science, Toho Univ.) ;
  • Saito, T. (Dept. of Physics, Faculty of Science, Toho Univ.) ;
  • Shinagawa, K. (Dept. of Physics, Faculty of Science, Toho Univ.) ;
  • Tsushima, T. (Dept. of Physics, Faculty of Science, Toho Univ.)
  • Published : 1995.10.01

Abstract

In order to consider the change of the magnetic anisotropy energy by the Al or Ga substitution for Fe, spin reorientation temperature $T_{SR}$ and Curie temperature $T_{c}$ in $R_{2}Fe_{17-x}M_{x}$ (R=Er, Tm, M=Al, Ga) have been studied both experimentally and theoretically. As a result, $T_{SR}$ and $T_{c}$ for $R_{2}Fe_{17-x}M_{x}$ shift toward higher temperature side with x ($0{\leq}x{\leq}2.0$). The ${\Delta}T_{c}$ the difference of the $T_{c}'s$ between $Er_{2}Fe_{17-x}Al_{x}$ and $Tm_{2}Fe_{17-x}Al_{x}$, is always about 10 K independent of Al-content. But in the case of Ga substitution, the ${\Delta}T_{c}$ increases with Ga-content ; especially, the ${\Delta}T_{c}$ for x=2.0 is 43 K. This value of the ${\Delta}T_{c}$ is not explained by only the difference of the de Gennes fator G between $Er^{3+}$ and $Tm^{3+}$, but it is thought that the values of $J_{ErFe}$ and $J_{TmFe}$ themselves are not equal. ($J_{AB}$ : the exchange interaction between A and B.)

Keywords

References

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