Abstract
We have demonstrated comparison of spin accumulation voltages in local and non-local (NL) magnetoresistance measurements without any spurious megnetoresistive signals. The spin transport length in a local measurement was larger than that in a NL measurement. An intensity of the local signals was explained by a conductivity mismatch theory. Depending on the relative magnetic configurations, Hanle-type spin precession signals in the local and the NL schemes showed a clear difference in signal shapes. The local transporting spins are accelerated in the direction of the electric field, and precess around the direction of the magnetic field under the detector electrode.
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