Low Sm doping effect on the low-field magnetoresistive properties in (La1-xSmx)0.67Sr0.33MnO perovskite
A series of polycrystalline samples (La1-xSmx) 0.67Sr0.33MnO3 (X=0.00, 0.05 and 0.10) were prepared using the conventional solid-state reaction method. The XRD analysis indicated that all the samples were fully crystalline and in a single phase with a rhombohedral structure after a sintering at 1200...
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Universiti Putra Malaysia Press
2009
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| Online Access: | http://psasir.upm.edu.my/id/eprint/15493/ http://psasir.upm.edu.my/id/eprint/15493/1/Low%20Sm%20doping%20effect%20on%20the%20low-field%20magnetoresistive%20properties%20in%20%28La1-xSmx%290.67Sr0.33MnO%20perovskite.pdf |
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| author | Lim, Kean Pah Shaari, Abdul Halim Chen, Soo Kien Ng, Siau Wei Zainuddin, Zalita Ye, Chau Yuen |
| author_facet | Lim, Kean Pah Shaari, Abdul Halim Chen, Soo Kien Ng, Siau Wei Zainuddin, Zalita Ye, Chau Yuen |
| author_sort | Lim, Kean Pah |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | A series of polycrystalline samples (La1-xSmx) 0.67Sr0.33MnO3 (X=0.00, 0.05 and 0.10) were prepared using the conventional solid-state reaction method. The XRD analysis indicated that all the samples were fully crystalline and in a single phase with a rhombohedral structure after a sintering at 1200°C for 24 hours in air. Meanwhile, the Atomic Force Microscopy measurements showed that a small amount of Sm doping in La sites affected the grain growth and this might affect the grain boundary layer, thus resulting in the reduction of the Curie temperature, TC. Extrinsic magnetoresistance (MR) was observed for all the samples with a large negative MR at low field (0-0.1 or 0.2T) region, followed by a slower varying MR at high field (0.1 or 0.2-1T). The highest low-field MR value of -4.6% (at 0.1T) and -6.1% (at 0.2T) were observed for sample X=0.10 and X=0.05, respectively. Hence, these indicated that the extrinsic MR was grain size dependent and was therefore enhanced with a small amount of Sm substitution in La sites. |
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| id | upm-15493 |
| institution | Universiti Putra Malaysia |
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| language | English |
| last_indexed | 2025-11-15T08:03:11Z |
| publishDate | 2009 |
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| spelling | upm-154932015-11-20T05:52:47Z http://psasir.upm.edu.my/id/eprint/15493/ Low Sm doping effect on the low-field magnetoresistive properties in (La1-xSmx)0.67Sr0.33MnO perovskite Lim, Kean Pah Shaari, Abdul Halim Chen, Soo Kien Ng, Siau Wei Zainuddin, Zalita Ye, Chau Yuen A series of polycrystalline samples (La1-xSmx) 0.67Sr0.33MnO3 (X=0.00, 0.05 and 0.10) were prepared using the conventional solid-state reaction method. The XRD analysis indicated that all the samples were fully crystalline and in a single phase with a rhombohedral structure after a sintering at 1200°C for 24 hours in air. Meanwhile, the Atomic Force Microscopy measurements showed that a small amount of Sm doping in La sites affected the grain growth and this might affect the grain boundary layer, thus resulting in the reduction of the Curie temperature, TC. Extrinsic magnetoresistance (MR) was observed for all the samples with a large negative MR at low field (0-0.1 or 0.2T) region, followed by a slower varying MR at high field (0.1 or 0.2-1T). The highest low-field MR value of -4.6% (at 0.1T) and -6.1% (at 0.2T) were observed for sample X=0.10 and X=0.05, respectively. Hence, these indicated that the extrinsic MR was grain size dependent and was therefore enhanced with a small amount of Sm substitution in La sites. Universiti Putra Malaysia Press 2009-07 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/15493/1/Low%20Sm%20doping%20effect%20on%20the%20low-field%20magnetoresistive%20properties%20in%20%28La1-xSmx%290.67Sr0.33MnO%20perovskite.pdf Lim, Kean Pah and Shaari, Abdul Halim and Chen, Soo Kien and Ng, Siau Wei and Zainuddin, Zalita and Ye, Chau Yuen (2009) Low Sm doping effect on the low-field magnetoresistive properties in (La1-xSmx)0.67Sr0.33MnO perovskite. Pertanika Journal of Science & Technology, 17 (2). pp. 291-297. ISSN 0128-7680; ESSN: 2231-8526 http://www.pertanika.upm.edu.my/Pertanika%20PAPERS/JST%20Vol.%2017%20(2)%20Jul.%202009/11%20Pages%20291-297.pdf |
| spellingShingle | Lim, Kean Pah Shaari, Abdul Halim Chen, Soo Kien Ng, Siau Wei Zainuddin, Zalita Ye, Chau Yuen Low Sm doping effect on the low-field magnetoresistive properties in (La1-xSmx)0.67Sr0.33MnO perovskite |
| title | Low Sm doping effect on the low-field magnetoresistive properties in (La1-xSmx)0.67Sr0.33MnO perovskite |
| title_full | Low Sm doping effect on the low-field magnetoresistive properties in (La1-xSmx)0.67Sr0.33MnO perovskite |
| title_fullStr | Low Sm doping effect on the low-field magnetoresistive properties in (La1-xSmx)0.67Sr0.33MnO perovskite |
| title_full_unstemmed | Low Sm doping effect on the low-field magnetoresistive properties in (La1-xSmx)0.67Sr0.33MnO perovskite |
| title_short | Low Sm doping effect on the low-field magnetoresistive properties in (La1-xSmx)0.67Sr0.33MnO perovskite |
| title_sort | low sm doping effect on the low-field magnetoresistive properties in (la1-xsmx)0.67sr0.33mno perovskite |
| url | http://psasir.upm.edu.my/id/eprint/15493/ http://psasir.upm.edu.my/id/eprint/15493/ http://psasir.upm.edu.my/id/eprint/15493/1/Low%20Sm%20doping%20effect%20on%20the%20low-field%20magnetoresistive%20properties%20in%20%28La1-xSmx%290.67Sr0.33MnO%20perovskite.pdf |