Fig. 3: LTEM measurements of Néel-type skyrmions in Fe2.84±0.05GaTe2.
a Schematic diagram of LTEM indicating the tilt angle θ with respect to the sample plane. All images were acquired with a defocus value of d = 2 mm. b Experimental and simulated Lorentz phase images of RT Néel-type skyrmions at ±20° and 0° tilt. The sample was previously applied field cooling (FC) with B = 30 mT. The illustration at the top utmost right panel shows a typical spin configuration of Néel-type skyrmions, while the bottom utmost right panel shows the corresponding magnetic induction field map at +20° tilt. c Temperature and magnetic field dependence of the skyrmion state. Note that the top row of Lorentz phase images at various temperatures were acquired individually after FC. The Lorentz phase images bounded by the dashed line represent the RT skyrmions evolution with increasing magnetic field. d Skyrmion phase diagram. The color indicates the skyrmion density ρsk. The black dashed line shows the boundary between skyrmion and ferromagnetic phase.
