Hard Magnetic Properties of Bulk Amorphous Alloys(Nano-materials)

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概要

• 論文の詳細を見る

• The amorphous phase in the Nd-Fe-Al and Pr-Fe-Al systems is formed in extremely wide composition ranges of 0 to 90 at% Fe and 0 to 93 at% Al by melt spinning. Ferromagnetic Ln_<90-x>Fe_xAl_<10> (Ln=Nd or Pr) bulk amorphous alloys with high coercive force at room temperature are obtained by a copper mold casting method. The maximum diameter of the cylindrical amorphous samples is 12 mm for the Nd-30%Fe-Al alloy and 3 mm for the Pr-30%Fe-Al alloys and decreases with deviating Fe content. Neither glass transition nor supercooled liquid region is observed in the temperature range before crystallization (T<T_x), which is different from other bulk amorphous alloys exhibiting wide supercooled liquid regions. The extremely high T_x/T_m and small ΔT_m(=T_m-T_x) values are the reason for the achievement of large glass-forming ability in these systems. The bulk amorphous Ln_<60>Fe_<30>Al_<10> alloys are ferromagnetic with the Curie temperature (T_c) of 515 to 600 K which are much higher than those for Nd-Fe and Pr-Fe binary amorphous ribbons. The remanence (B_r) and intrinsic coercive force (_iH_c) are 0.089 to 0.122 T and 277 to 321 kA/m, respectively, and the crystallization to Ln+Al_2Ln+δ phases causes a ferromagnetic- to -paramagnetic phase transition. Thus, the hard magnetic properties are achieved only in the amorphous state.bulk amorphous permanent magnetferromagnetic bulk amorphous alloypraseodymium-iron-aluminum alloycopper mold castinglarge glass-forming abilityhigh reduced glass transition temperaturehigh coercive forceferromagnetic clusterrelaxation-induced clusterrandom magnetic anisotropy

• 東北大学の論文
• 1997-03-31

著者

• INOUE Akihisa

  Institute for Materials Research, Tohoku University

• Aoki T

  Department Of Biochemical Science And Technology Faculty Of Agriculture Kagoshima University

• Zhang Tao

  Institute For Materials Research Tohoku University

• Inoue Akihisa

  Institute For Materials Research

• TAKEUCHI Akira

  Institute of Materials Research (IMR), Tohoku University

• Takeuchi A

  Department Of Biological Science Faculty Of Science Nara Women's University

• Takeuchi Akira

  Institute For Materials Research Tohoku University

• Inoue Akihisa

  Institiute For Materials Resarch Tohoku University

• 竹内 章

  Tohoku Univ. Sendai Jpn

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