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We present a magnetic study of the Gd$_3$N@C$_{80}$ molecule, consisting of aGd-trimer via a Nitrogen atom, encapsulated in a C$_{80}$ cage. This molecularsystem can be an efficient contrast agent for Magnetic Resonance Imaging (MRI)applications. We used a low-temperature technique able to detect small magneticsignals by placing the sample in the vicinity of an on-chip SQUID. Thetechnique implemented at NHMFL has the particularity to operate in highmagnetic fields of up to 7 T. The Gd$_3$N@C$_{80}$ shows a paramagneticbehavior and we find a spin transition of the Gd$_3$N structure at 1.2 K. Weperform quantum mechanical simulations, which indicate that one of the Gd ionschanges from a $^8S_{7/2}$ state ($L=0, S=7/2$) to a $^7F_{6}$ state ($L=S=3,J=6$), likely due to a charge transfer between the C$_{80}$ cage and the ion.

Spin transition in Gd$_3$N@C$_{80}$, detected by low-temperature on-chip SQUID technique