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Bias-dependence of (a) MR ratio and (b) the corresponding IET spectra. The MR ratio was obtained from the curve, , [, where and , respectively, represent dynamic resistance with parallel and antiparallel magnetic configurations] for MTJ with of . IET spectra for the parallel and antiparallel magnetization configurations are shown.
IET spectra in an antiparallel magnetization configuration. Spectra are measured for various thicknesses of MgO tunnel barriers, . Base lines for respective spectra are shifted to clarify the spectrum shape. For MTJs with thinner barrier thickness, the maximum applied voltage was reduced to avoid junction breakdown.
IET spectra in a parallel magnetization configuration. Spectra are measured for various thicknesses of MgO tunnel barrier, . Base lines for respective spectra are shifted. Thin broken lines represent approximate peak positions: first , second , and third .
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