Magnetism of Body-Centered Tetragonal FeRh1-xPdx Alloys. (I). Magnetic Properties.

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  • Yuasa Shinji
    Department of Physics, Faculty of Science and Technology, Keio University, Hiyoshi 3–14–1, Kohoku, Yokohama 223
  • Miyajima Hideki
    Department of Physics, Faculty of Science and Technology, Keio University, Hiyoshi 3–14–1, Kohoku, Yokohama 223
  • Otani Yoshichika
    Department of Physics, Faculty of Science and Technology, Keio University, Hiyoshi 3–14–1, Kohoku, Yokohama 223
  • Sakuma Akimasa
    Magnetic and Electronic Materials Research Laboratory, Hitachi Metals, Ltd., Mikajiri 5200, Kumagaya, Saitama 360

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  • Magnetism of Body-Centered Tetragonal FeRh1-xPdx Alloys-1-Magnetic Properties
  • Magnetism of Body Centered Tetragonal F
  • Magnetism of Body-Centered Tetragonal FeRh<sub>1-<i>x</i></sub>Pd<sub><i>x</i></sub>Alloys (I) Magnetic Properties

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Crystalline structures and magnetic properties of the FeRh1-xPdx system were investigated. Substitution of Pd for Rh stabilized body-centered tetragonal (bct) structure of the ordered CuAu-type with increasing axial ratio c/a from 1.18 to 1.36. The bctalloys in the range x=0.530-- 0.61 exhibited a first-order phase transition from antiferromagnetic to ferromagnetic state, while the bct alloys with x<0.530 exhibited a first-order phase transition from antiferromagnetic to Curie paramagnetic state. Both the axial ratio and the volume increased abruptly at the transitions. A new ferromagnetic phase with orthorhombic structure with the space group Cmmm was found in the bct alloys with x=0.525-- 0.61 below room temperature. This ferromagnetic phase possesses a larger magnetic moment than that of the bct phase. Reduction of the crystalline symmetry may have enhanced the magnetic moment.

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