  Superconducting spintronics has emerged in the last decade as a promising new
field that seeks to open a new dimension for nanoelectronics by utilizing the
internal spin structure of the superconducting Cooper pair as a new degree of
freedom. Its basic building blocks are spin-triplet Cooper pairs with equally
aligned spins, which are promoted by proximity of a conventional superconductor
to a ferromagnetic material with inhomogeneous macroscopic magnetization. Using
low-energy muon spin rotation experiments, we find an entirely unexpected novel
effect: the appearance of a magnetization in a thin layer of a non-magnetic
metal (gold), separated from a ferromagnetic double layer by a 50 nm thick
superconducting layer of Nb. The effect can be controlled by either temperature
or by using a magnetic field to control the state of the remote ferromagnetic
elements and may act as a basic building block for a new generation of quantum
interference devices based on the spin of a Cooper pair.
