Large room-temperature magnetoresistance and temperature-dependent magnetoresistance inversion in La0.67Sr0.33MnO3/Alq3 - Co nanocomposites/Co devices |
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| Authors: | Liang Lin Fenggong Wang Yong Zhao Shenghao Han |
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| Affiliation: | a School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, PR Chinab School of Space Science and Physics, Shandong University at Weihai, Weihai 264209, PR Chinac School of Materials Science and Engineering, University of New South Wales, Sydney 2052, NSW, Australiad Hefei National laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei 230026, PR China |
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| Abstract: | Large room-temperature (RT) magnetoresistance (MR) and temperature-dependent MR inversion have been observed in tris (8-hydroxyquinoline) aluminum (Alq3)-cobalt nanocomposites-based organic-inorganic hybrid devices. Negative MR-high resistance for parallel electrodes configuration — due to magnetization reversal of ferromagnetic (FM) electrodes has been observed at low temperatures. As the temperature increases, the MR undergoes a sign change. At room temperature, a positive MR of ∼9.7% with the resistivity dropping monotonously with increasing magnetic fields has been observed. The RT MR is about two orders of magnitude of that in organic-FM nanocomposites measured with nonmagnetic electrodes. The enhancement of RT MR is attributed to the injection of spin polarized carriers into Alq3-Co nanocomposites. |
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| Keywords: | A. Alq3-cobalt nanocomposites B. Evaporation C. Sandwiched structure D. Magnetoresistance |
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