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(a) Schematic diagram of the device structure with the measurement geometry. (b) Magnetic properties of ferromagnetic system consisting of a 20 nm thick Tb20Fe62Co18 layer and a 0.8 nm thick Co40Fe40B20 layer with and without a MgO layer.
Three-terminal Hanle signals at 20 K (a) with a MgO barrier, (b)without any barrier, and (c) with Ta/MgO barriers. In (a), when the perpendicular field, which is parallel to the magnetization of ferromagnet, isapplied, no inverted Hanle signal is detected (triangles).
Hanle signals at various temperatures. The curves are shifted for clarity.
Temperature dependences of spin signals and parameters of the device with a MgO barrier. (a) Magnitude of Hanle signal, ΔV S /I and (b)spin lifetime, τ sp. The dotted line in (a) presents the magnitude of Hanle signal for the device without a MgO barrier.
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