Fig. 1: Characterizations of Fe3−xGaTe2.

a ZFC (dashed) and FC (solid) curves of bulk Fe3−xGaTe2 measured with an out-of-plane (red) and an in-plane (blue) magnetic field of 200 Oe. Inset shows the derivative of the out-of-plane FC curve. b Out-of-plane bulk isothermal magnetization. c Hall resistance of a 136 nm-thick Fe3−xGaTe2 flake. The red step curve in the device photo is the height profile and the scale bar is 10 μm. d L-TEM images of labyrinth domains (left) and field-induced skyrmions (middle and right) in a 179 nm-thick Fe3−xGaTe2 flake. The sample is ZFC from 370 to 295 K before imaging. e Intensity profile of a skyrmion under reversed tilt angles. f Schematic of a Néel-type skyrmion.