Abstract
A series of Co x (Alq 3) 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.
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