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(Color online) (a) Scanning electron micrograph of our quantum-dot spin-valve device. (b) Differential conductance as a function of and at . The regions enclosed by the dashed line show Coulomb blockade regime. The two white areas outside the enclosed regions are beyond the limits of measurement range. (c) The conductance as a function of measured at .
(Color online) TMR changes with . The MR ratio (%) is denoted as , where and are the tunnel currents for zero field and for a magnetic field of , respectively. The TMR value is defined as the maximum change in the MR value showing hysteretic behavior [see inset of Fig. 2(b)]. The gate voltages are (a) 2.78, (b) 2.79, (c) 2.80, and (d) .
(Color online) Magnitude and sign changes of the TMR with (left axis) together with the Coulomb oscillation data given in Fig. 1(c) (right axis).
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