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Synthetic ferrimagnets based on Co and Gd bear promise for directly bridgingthe gap between volatile information in the photonic domain and non-volatileinformation in the magnetic domain, without the need for any intermediaryelectronic conversion. Specifically, these systems exhibit strong spin-orbittorque effects, fast domain wall motion and single-pulse all-optical switchingof the magnetization. An important open challenge to bring these materials tothe brink of applications is to achieve long-term stability of their magneticproperties. In this work, we address the time-evolution of the magnetic momentand compensation temperature of magnetron sputter grown Pt/Co/Gd trilayers withvarious capping layers. Over the course of three months, the net magneticmoment and compensation temperature change significantly, which we attribute toquenching of the Gd magnetization. We identify that intermixing of the cappinglayer and Gd is primarily responsible for this effect, which can be alleviatedby choosing nitrides for capping as long as reduction of nitride to oxide isproperly addressed. In short, this work provides an overview of the relevantaging effects that should be taken into account when designing syntheticferrimagnets based on Co and Gd for spintronic applications.

Aging and passivation of magnetic properties in Co/Gd bilayers