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We study spin accumulation in an aluminium island, in which the injection ofa spin current and the detection of the spin accumulation are done by means offour cobalt electrodes that connect to the island through transparent tunnelbarriers. Although the four electrodes are designed as two electrode pairs ofthe same shape, they nonetheless all exhibit distinct switching fields. As aresult the device can have several different magnetic configurations. From themeasurements of the amplitude of the spin accumulation, we can identify theseconfigurations, and using the diffusion equation for the spin imbalance, weextract the spin relaxation length $\lambda_\mathrm{sf} = 400 \pm 50$~nm and aninterface spin current polarization $P = (10 \pm 1)%$ at low temperature and$\lambda_\mathrm{sf} = 350 \pm 50$~nm, $P = (8 \pm 1)%$ at room temperature.

Spin accumulation probed in multiterminal lateral all-metallic devices