Fig. 6

(double columns) Spatial variation of local density of state near the junction at 77 K. a–t A set of differential conductance maps obtained near a junction of three domains and DWs. All of spectra are normalized to the same tunneling resistance with −50 mV and 100 pA. Differential conductance spectra are obtained by demodulated lock-in signal using 10 mV of oscillation at 20 different biases from −100 to 100 mV. Twenty lock-in measurements are interlaced in between each line-scan of the topography shown in u to minimize the effect of thermal drift. There appear two different characteristics from the DWs. Two DWs on the upper left corner show depressed local density of state at energies below −50 mV, and start to show enhanced conductance above −50 mV. On the contrary, the DW in the right bottom corner shows the opposite feature, i.e., enhanced below −50 mV and suppressed above −50 mV. u, STM topography of the same area with the 40 × 40 nm² image size. Scale bar: 10 nm