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Focused ion beam fabrication and magneto-electrical transport properties of La0.67Ca0.33MnO3 nanobridge |
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| Authors: | Y. J. Li D. Y. Dong S. L. Wang Z. P. Wu C. Cui P. G. Li L. H. Li J. H. Xiao W. H. Tang |
| Affiliation: | 1. Center for Optoelectronics Materials and Devices, Zhejiang Sci-Tech University, Hangzhou, 310018, People’s Republic of China 2. State Key Laboratory of Information Photonics and Optical Communication, School of Science, Beijing University of Posts and Telecommunications, Beijing, 100876, People’s Republic of China 3. Department of Physics, The State University of New York at Potsdam, 44 Pierrepont Avenue, Potsdam, NY, 13676-2294, USA |
| Abstract: | La0.67Ca0.33MnO3 particle films with an average particle size of ~150 nm were grown on single-crystal silicon substrate using pulsed electron deposition technique and then focused ion beam was introduced to fabricate nanobridge in size of 300 × 900 nm on the particle film. The magneto-transport properties of both samples were studied. For the film, there is only one resistance peak at 182 K in temperature-dependent resistance (R–T) curves, which is far lower than ferromagnetic–paramagnetic transition temperature (T C) of 250 K. When compared to the film, double peaks were observed in both R–T curves and magnetoresistance dependent on temperature (MR–T) curves of the nanobridge, one peak is at 186 K, which is very close to metal–insulator transition temperature (T P) of film, the other one is at 250 K, which is close to the T C of film, and these two peaks caused separately by grain and grain boundary (GB), which demonstrated that the electrical transport behavior of grain was separated from that of GB. |
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