title: Giant enhancement of spin accumulation and long-distance spin precession in metallic lateral spin valves.
abstract: The non-local spin injection in lateral spin valves is strongly expected to be an effective method to generate a pure spin current for potential spintronic application. However, the spin-valve voltage, which determines the magnitude of the spin current flowing into an additional ferromagnetic wire, is typically of the order of 1 μV. Here we show that lateral spin valves with low-resistivity NiFe/MgO/Ag junctions enable efficient spin injection with high applied current density, which leads to the spin-valve voltage increasing 100-fold. Hanle effect measurements demonstrate a long-distance collective 2π spin precession along a 6-μm-long Ag wire. These results suggest a route to faster and manipulable spin transport for the development of pure spin-current-based memory, logic and sensing devices.
authors.affiliation: Advanced Science Institute, RIKEN, 2-1 Hirosawa, Wako 351-0198, Japan. yfukuma@riken.jp
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Fukuma
authors.forename: Le
authors.initials: L
authors.lastname: Wang
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Idzuchi
authors.forename: Saburo
authors.initials: S
authors.lastname: Takahashi
authors.forename: Sadamichi
authors.initials: S
authors.lastname: Maekawa
authors.forename: YoshiChika
authors.initials: Y
authors.lastname: Otani