Spin device, driving method of the same, and production method of the same

A spin device comprising:

• a graphene;
• a first ferromagnetic electrode and a second electrode that are disposed in electrical contact with the graphene in such a manner as to sandwich the graphene;
• a third ferromagnetic electrode and a fourth electrode that are disposed apart from the first ferromagnetic electrode and the second electrode and in electrical contact with the graphene, in such a manner as to sandwich the graphene;
• a current applying portion that applies an electric current between the first ferromagnetic electrode and the second electrode which sandwich the graphene;
• and
• a voltage-signal detecting portion that detects spin accumulation information as a voltage signal via the third ferromagnetic electrode and the fourth electrode, the spin accumulation information being generated, by application of the electric current, in a part of the graphene that is sandwiched between the third ferromagnetic electrode and the fourth electrode, wherein
• the first ferromagnetic electrode and the third ferromagnetic electrode are disposed on the same surface of the graphene, and
• the second electrode and the fourth electrode are non-magnetic electrodes or ferromagnetic electrodes.