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Ferrimagnetic alloys are extensively studied for their unique magneticproperties leading to possible applications in perpendicular magneticrecording, due to their deterministic ultrafast switching and heat assistedmagnetic recording capabilities. On a prototype ferrimagnetic alloy wedemonstrate fascinating properties that occur close to a critical temperaturewhere the magnetization is vanishing, just as in an antiferromagnet. From theX-ray magnetic circular dichroism measurements, an anomalous 'wing shape'hysteresis loop is observed slightly above the compensation temperature. Thisbears the characteristics of an intrinsic exchange bias effect, referred to asatomic exchange bias. We further exploit the X-ray magnetic linear dichroism(XMLD) contrast for probing non-collinear states which allows us todiscriminate between two main reversal mechanisms, namely perpendicular domainwall formation versus spin-flop transition. Ultimately, we analyze theelemental magnetic moments for the surface and the bulk parts, separately,which allows to identify in the phase diagram the temperature window where thiseffect takes place. Moreover, we suggests that this effect is a generalphenomenon in ferrimagnetic thin films which may also contribue to theunderstanding of the mechanism behind the all optical switching effect.

X-ray magnetic linear dichroism as a probe for non-collinear magnetic state in ferrimagnetic single layer exchange bias systems