Magnetism at the interface of non-magnetic Cu and C60.

The signature of magnetism without a ferromagnet in a non-magnetic heterostructure is novel as well as fascinating from a fundamental research point of view. It has been shown by Al'Mari et al. that magnetism can be induced at the interface of Cu/C60 due to a change in the density of states. However, the quantification of such an interfacial magnetic moment has not been performed yet. In order to quantify the induced magnetic moment in Cu, we have performed X-ray magnetic circular dichroism (XMCD) measurements on Cu/C60 multilayers. We have observed room temperature ferromagnetism in the Cu/C60 stack. Further XMCD measurements show that a ∼0.01 µB per atom magnetic moment has been induced in Cu at the Cu/C60 interface.