Journal of the Korean Magnetics Society (한국자기학회지)

The Korean Magnetics Society (한국자기학회)
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Magnetic Properties of Polycrystalline ErFe2O4

ErFe2O4 다결정체 시료의 자기적 특성 연구

  • Kim, J. (Department of Physics, Hankuk University of Foreign Studies) ;
  • Lee, B.W. (Department of Physics, Hankuk University of Foreign Studies)
  • 김재영 (한국외국어대학교 물리학과) ;
  • 이보화 (한국외국어대학교 물리학과)
  • Published : 2008.12.31
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Abstract

We have investigated the magnetic properties of $ErFe_2O_4$. Stoichiometric polycrystalline sample of $ErFe_2O_4$ was prepared by solid-state reaction method in a stream of CO/$CO_2$ gas. The X-ray power diffraction pattern shows that the diffraction peaks are indexed with respect to the rhombohedral structure with a space group of R3m. The temperature dependent magnetization for $ErFe_2O_4$ shows two-step phase transitions at about 220 and 250 K. The transition at 250 K is an antiferromagnetic transition and that at 220 K is a structural transition.

Rare-earth iron oxide $ErFe_2O_4$의 다결정체 시료의 자기적 특성을 연구하였다. 단일상의 다결정체 $ErFe_2O_4$ 시료를 CO/$CO_2$ gas 분위기에서 고체상태반응법으로 합성하였다. X-ray diffraction 측정을 통해 $ErFe_2O_4$ 시료는 space group R3m Rhombohedral 구조를 가지며, 온도에 의존하는 magnetization 측정을 통해 250 K에서는 자기적 전이가, 220 K에서는 구조적 전이가 일어나는 2단계 상전이 현상을 확인하였다.

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