Abstract. The influence of the interfacial spin configuration on specific magnetic phenomena in exchange coupled magnetic phases is briefly discussed. The ability of the ⁵⁷Fe Mössbauer technique to reveal the spin structures at the interface of iron containing magnetic phases is emphasized for some particular cases. Experimental results obtained on layered exchange-bias systems and on nanocomposites exchange-spring magnets are presented. The influence of the ferromagnetic top layer on the interfacial spin configuration of the bottom antiferromagnetic layer of the Fe/FeSn₂ exchange-bias system is illustrated. A possibility for evaluating the inter-phase coupling strength via Mössbauer spectroscopy in Fe/Nd₂Fe₁₄B exchange-spring ribbons is described.

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