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(Color online) Spin-current amplifier. (a) Schematic diagram of a spin-current amplifier (not to scale). (b) The magnetization directions of the three ferromagnetic contact pads S, D1, and D2 as the magnetic field is swept in both directions. Each group of three arrows (left to right) represents the magnetization directions of S, D2, and D1 contact pads, respectively. The distinct states of magnetizations M1–M4 and the corresponding values for each state are shown for to sweep.
(Color online) Drain2 current. (a) Current as a function of magnetic field for different with set to their corresponding null values at . (b) Current as a function of magnetic field for different temperatures with and . The filled (open) symbols corresponds to to ( to ) sweep.
(Color online) (a) Peak drain2 current as a function of in state M3. The solid circles represent measured data at and the solid line represents the theoretically calculated values based on Eq. (3). The spin-diffusion length is found to be at . (b) The antisymmetric (symmetric) electrochemical potential difference between spin-up and spin-down electrons in the channel when S and D1 contact magnetizations are parallel (antiparallel) for two different temperatures and .
(Color online) Dual control of output. The closed (open) symbols represent gain . (a) Gain and as a function of for varying at . (b) Gain and as a function of for varying at . A constant offset voltage is subtracted from each of the values.
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