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Provided is a new spin current source regarding an acoustic wave to spin current conversion element. An acoustic wave generation member, a magnetic substance member which generates a spin current by an acoustic wave from the acoustic wave generation member, an inverse spin Hall effect member into which the spin current generated by the magnetic substance member is poured, and a magnetic field application means which restricts the magnetization direction of the magnetic substance member are provided, and an acoustically induced spin current or voltage is taken out of the inverse spin Hall effect member.
