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The magnetic/organic/magnetic spin valve structure has been fabricated with -conjugated molecular pyrrole derivative 3-hexadecyl pyrrole as the spacer layer by Langmuir-Blodgett ͑LB͒ technique. It shows giant magnetoresistance ͑MR͒ as large as 20% at room temperature, demonstrating that low-energy electrons can traverse the molecular barrier while remaining spin polarized. The spin transport across organic structures is diffusive from its current-voltage ͑I-V͒ curve under bias voltage up to 1 V. The MR value decreased when the LB-film layer increased. The telegraph noise and the layer dependent MR value suggest that the spin-polarized transport signals can be degraded by localized states in the molecular barriers and barrier quality.

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