Investigation of Spin-Dependent Transport Properties and Spin–Spin Interactions in a Copper-Phthalocyanine–Cobalt Nanocomposite System

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We have fabricated a series of copper-phthalocyanine–cobalt (CuPc–Co) nanocomposites (compositional ratio of $\text{CuPc}:\text{Co}=4:1$), wherein Co nanoparticles were embedded within a CuPc matrix, in order to study the spin transport properties and to investigate spin–spin interactions between conducting spins and localized spins in the CuPc. Nonlinear characteristics of electric current, $I$–$V^{(2N-1)}$, ($V$: bias voltage, $N$: order of co-tunneling) were observed, where the fifth order co-tunneling was clarified. The order of the co-tunneling effect in CuPc–Co was almost equal to that in a rubrene–Co nanocomposite with almost the same diameter of the Co nanoparticles. We have not found clear evidence of spin-flip processes, as observed in other molecular systems, which may be attributed to the spin-coupling between localized spins in the CuPc and spins in Co.
2010-03-25