Fig. 2: Wall chirality switching by Hx pulse.
From: Néel domain walls with bistable chirality in a perpendicularly magnetized ferrimagnetic insulator
a–d Wide-field MOKE images of a DW on the racetrack whose edges are denoted by horizontal dashed lines. Dark color corresponds to an up domain and gray corresponds to a down domain. The DW positions in each frame are denoted by white dashed lines. The area to the left of the vertical red dashed line corresponds to the region covered by the contact pad and therefore does not show magnetic contrast. An up-down (down-up) wall is first initialized in the track (a). The arrows on the left of each frame denote the operation sequence of field and current pulses between the previous and the current frames. b–d The DW positions after the corresponding operations, which are denoted on the left of each frame. The DW moment orientation is set to the left by a \({H}_{x}^{{{\rm{set}}}}\) pulse (\(500\) Oe, \(500\) ms), which results in DW motion to the right (left) for a CCW (CW) DW (a–b). The wall chirality is then switched twice by \({H}_{x}^{{{\rm{sw}}}}\) pulse (330 Oe, 1 s) to CW (CCW) and then to CCW (CW), which results in DW motion to the left (right) and then to the right (left) (b, c and c, d). The current pulse used to drive the DW is fixed at \(1.33\times {10}^{11}{{\rm{A}}}/{{{\rm{m}}}}^{2}\), 10 ms.
