Figure 5

TMR voltage dependencies for symmetric \({L}_{\mathrm{1(2)}}=1.0\) nm and asymmetric cases. Asymmetric parameters \({L}_{1}=1.0\) nm, \({L}_{2}=0.9\) nm for (a) and \({L}_{1}=0.9\) nm, \({L}_{2}=1.0\) nm for (b) correspond to \({d}_{{\rm{av}}}=1.45\) nm and \({d}_{{\rm{av}}}=2.63\) nm, respectively. The related asymmetric resistance behaviors of the TMR curves depicted in (a) and (b) are shown in (d) and (e), respectively. (c) Size distributions. (f) Temperature dependence of the symmetric TMR behavior at \({d}_{{\rm{av}}}=1.45\) nm.