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We have measured resonant soft x-ray diffuse magnetic scattering as afunction of temperature in a positively exchange biased Co/FeF2 bilayer andanalyzed the data in the distorted wave Born approximation to obtain in-planecharge and magnetic correlation lengths associated with the Co and FeF2 layersand estimate interfacial roughness. Tuning to the Fe and Co L3 edges revealssignificantly different temperature trends in these quantities in theantiferromagnetic and ferromagnetic layers, respectively. While the magneticcorrelation length of the uncompensated interfacial spins in FeF2 layerincrease as temperature decreases, these quantities remain unchanged in the Colayer. Our results indicate that uncompensated Fe spins order within a range offew hundred nanometers in otherwise randomly distributed uncompensated magneticmoments, giving rise to spin clusters in the antiferromagnet whose sizeincrease as the temperature decrease.

Temperature dependence of in-plane correlation lengths in exchange biased Co/FeF2