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Magnetic properties, microstructures and magnetoresistance effect in Co/Alq3 granular films |
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| Authors: | XM Zhao G Ni Q Shu JQ Wu B Ma QY Jin |
| Institution: | a Department of Optics Science and Engineering, Fudan University, Shanghai 200433, PR China b State Key Laboratory for Advanced Photonic Materials and Devices, Fudan University, Shanghai 200433, PR China c Laboratory of Advanced Materials, Fudan University, Shanghai 200433, PR China d National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, Jiangsu 210093, PR China |
| Abstract: | A series of Cox(Alq3)1−x granular films were prepared using the co-evaporating technique. HRTEM images show typical characteristics of granular films with the average size of 2-5 nm. It shows a gradual change from superparamagnetism to ferromagnetism with the rise of x. Negative magnetoresistance (MR) was observed, reaching −5.31% in x=0.44 sample at 30 K under the field of 10 kOe. The concentration dependence of MR and resistivity is also investigated. The inter-particle tunneling is believed to account for the negative MR effect. |
| Keywords: | 81 07 P 75 47 M 72 80 R |
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