| Original Articles |
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Giant Magnetoresistance in La0.67Ca0.33MnO3/Alq3/Co Sandwiched-Structure Organic Spin Valves |
| PANG Zhi-Yong;CHEN Yan-Xue;LIU Tian-Tian;ZHANG Yun-Pang;XIE Shi-Jie;YAN Shi-Shen;HAN Sheng-Hao |
| School of Physics and Microelectronics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100 |
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| Cite this article: |
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PANG Zhi-Yong, CHEN Yan-Xue, LIU Tian-Tian et al 2006 Chin. Phys. Lett. 23 1566-1569 |
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Abstract La0.67Ca0.33MnO3/Alq3/Co sandwiched-structure organic spin valves are fabricated by vacuum thermal evaporation method. A giant magnetoresistance (GMR) of 14% is observed at low temperature 100K. At 30K, the magnetoresistance can increase to 50%. The large GMR of the device is attributed to the high spin polarization and low conductivity of the La0.67Ca0.33MnO3 contact. The magnetoresistance ΔR/R and the coercive field of the Co electrode depend strongly on temperature. The large high-field magnetoresistance reported on La0.67Sr0.33MnO3/Alq3/Co organic spin valves [Nature 427 (2004) 821] is not observed in our La0.67Ca0.33MnO3/Alq2/Co organic spin valves.
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| Keywords:
72.25.Dc
72.25.Hg
75.47.De
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Published: 01 June 2006
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| PACS: |
72.25.Dc
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(Spin polarized transport in semiconductors)
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72.25.Hg
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(Electrical injection of spin polarized carriers)
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75.47.De
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(Giant magnetoresistance)
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