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Al이 치환된 Co 페라이트에 관한 뫼스바우어 분광법 및 중성자 회절 연구
김삼진(Sam Jin Kim),명보라(Bo Ra Myoung),김철성(Chul Sung Kim),백경선(Kyung Seon Baek) 한국자기학회 2006 韓國磁氣學會誌 Vol.16 No.6
Al substituted CoAl<SUB>0.5</SUB>Fe<SUB>1.5</SUB>O₄ has been studied with x-ray and neutron diffraction, Mossbauer spectroscopy and magnetization measurements. CoAl<SUB>0.5</SUB>Fe<SUB>1.5</SUB>O₄ revealed a cubic spinel structure of ferrimagnetic long range ordering at room temperature, with magnetic moments of Fe³?(A)(?2.29 μ<SUB>B</SUB>), Fe³?(B)(3.81 μ<SUB>B</SUB>), Co²?+(B) (2.66 μ<SUB>B</SUB>), respectively. The temperature dependence of themagnetic hyperfine field in ??Fe nuclei at the tetrahedral (A) and octahedral (B) sites was analyzed based on the Neel theory of magnetism. In the sample of CoAl<SUB>0.5</SUB>Fe<SUB>1.5</SUB>O₄, the intersublattice A-B interaction and intrasublattice A-A superexchange interaction were antiferromagnetic with strengths of J<SUB>A-B</SUB>= ?19.3 ± 0.2 k<SUB>B</SUB> and J<SUB>A-A</SUB> = ?21.6 ± 0.2 k<SUB>B</SUB>, respectively, while the intrasublattice B-B superexchange interaction was found to be ferromagnetic with a strength of J<SUB>B-B</SUB>= 3.8 ± 0.2 k<SUB>B</SUB>.