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An electron interferometer was designed and fabricated via a normalmetal/insulator/ferromagnet non-local lateral spin valve with a ring-shapednormal metal/insulator spacer, and spin current interference was observed. Avery high spin signal of 200 m$\Omega$ was found in a device with 2 $\mu$minjector-detector distance and magnetic field swept parallel to the plane. Witha perpendicular magnetic field sweep, a Hanle effect measurement showed bothspin precession and $h/e$ oscillation. Because of the non-adiabatic nature ofthe precessing spins at low fields as they traverse the normal metal ring, thisis an experimental observation of Aharonov-Anandan's non-adiabatic geometricphase. In addition, our observation of identical spin resistance for normal andsuperconducting Aluminum is inconsistent with theoretical predictions based onthe quasiparticle picture. To explain the superconducting spin current wesuggest that spin triplet Cooper pairs may exist in thin films of Aluminum fordirect spin injection.

Non-local spin valve interferometer: Observation of superconducting spin current and Aharonov-Anandan's non-adiabatic geometric phase