fig2

Figure 2. Magnetic-field-dependent top-surface MFM images of L₉S₆ super lattice under out-of-plane magnetic fields. (A)MFM images acquired at 75 K during a magnetic field loop applied along the out-of-plane direction. The magnetic field sequence is: -0.00 T → -0.06 T → -1.00T → -11.80 T → -5.00 T → -1.00 T → -0.00T → 0.30 T → 1.00 T → 5.00 T → 10.00 T → 5.00 T → 1.00 T → 0.00 T. The blue box high lights the field region (-1.00T) where stripe-like domains exhibit optimal contrast; (B) Corresponding MFM images at 25 K with the field sequence: -0.00 T → -0.05 T → -1.00 T → -10.00 T → -5.00 T → -1.00 T → -0.00 T → 0.30 T → 1.00 T → 5.00 T → 11.80 T → 5.00 T → 1.00 T → 0.00 T. Arrows indicate the field sweep directions. No circular skyrmion-like features are observed even at fields up to 11.8 T. The colour scales for images in A (in arrow order) are 0.18, 0.65, 0.55, 0.35, 0.55, 0.7, 0.16, 0.65, 0.55, 0.55, 0.5, 0.4, 0.65, and 0.16 Hz, respectively. The colour scales for images in B (in arrow order) are 0.2, 1.5, 0.8, 0.65, 1.0, 1.1, 0.16, 1.3, 0.8, 0.9, 0.8, 1.0, 0.9, and 0.2 Hz, respectively. MFM: Magnetic force microscopy.