Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Structural, Electrical and Magnetic Properties of Wide Bandgap Diluted Magnetic Semiconductor CuAl1-xMnxO2 Ceramics

널은 띠간격 묽은 자성반도체 CuAl1-xMnxO2 세라믹스의 구조 및 전자기 특성

  • Ji Sung Hwa (Department of Materials Science and Engineering, Chungnam National University) ;
  • Kim Hyojin (Department of Materials Science and Engineering, Chungnam National University)
  • 지성화 (충남대학교 신소재공학부 재료공학전공) ;
  • 김효진 (충남대학교 신소재공학부 재료공학전공)
  • Published : 2004.08.01
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Abstract

We investigated the structural, electrical and magnetic properties of Mn-doped $CuAlO_2$ delafossite ceramics ($CuAl_{1-x}Mn_{x}O_2,\;0\le\;x\;\le0.05$), synthesized by solid-state reaction method in an air atmosphere at a sintering temperature of $1150^{\circ}C$. The solubility limit of Mn ions in delafossite $CuAlO_2$ was found to be as low as about 3 $mol\%$. Positive Hall coefficient and the temperature dependence of conductivity established that non-doped $CuAlO_2$ ceramic is a variable-range hopping p-type semiconductor. It was found that the Mn-doping in $CuAlO_2$ rapidly reduced the hole concentration and conductivity, indicating compensation of free holes. The analysis of the magnetization data provided an evidence that antiferromagnetic superexchange interaction is the dominant mechanism of the exchange coupling between Mn ions in $CuAl_{1-x}Mn_{x}O$ alloy, leading to an almost paramagnetic behavior in this alloy.

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