| 학회 |
한국재료학회 |
| 학술대회 |
2009년 봄 (05/21 ~ 05/22, 무주리조트) |
| 권호 |
15권 1호 |
| 발표분야 |
전자재료 |
| 제목 |
Enhanced low-field magnetoresistance in (1−x)La0.7Ca0.3MnO3 /x(CuFe2O4) composites |
| 초록 |
The (1−x)La0.7Ca0.3MnO3/x(CuFe2O4), (x = 0 ~ 0.15) composites were prepared by conventional solid state reaction method. We have investigated the structural, magnetic and electrical properties of (1−x)La0.7Ca0.3MnO3/x(CuFe2O4) composites using X-ray diffraction (XRD), scanning electron microscopy, field cooled dc magnetization and magnetoresistance (MR) measurements. The XRD and SEM results indicate that no reaction occurs between LCMO and CFO grains, and that CFO segregates mostly at the grain boundaries of LCMO. The resistance measured as a function temperature demonstrates that all the samples display metal to semiconductor transition. The MR was measured in the presence of low magnetic field. The magnetoresistance (MR) effect is enhanced at a wide temperature range in an applied magnetic field (5 kOe). The spin-polarized tunneling and the spin-dependent scattering may be attributed to the enhanced low-field magnetoresistance (LFMR) effect. |
| 저자 |
김영주, Shalendra Kumar, 서용준, 이찬규, 구본흔
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| 소속 |
창원대 |
| 키워드 |
(1−x)La0.7Ca0.3MnO3 /x(CuFe2O4); Grain boundary; Spin polarized scattering; LFMR
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| E-Mail |
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