Figure 2

LTEM images of SyF nanowire with 800 nm wide track. The sequence of images shows the reversal of the ellipse and nucleation of a 180° AFM DW. The layers are t ₁ = 13.3 nm and t ₂ = 6.6 nm thick separated by a 0.7 nm thick Ru spacer layer. The transmission images contain contrast that arises as a projection of both layers. The images are taken for applied in-plane horizontal fields of (a), −650 Oe, saturation state, (b) 0 Oe, ellipse reversed and 360° wall formed in the thinner Co₉₀Fe₁₀ layer, (c) 40 Oe, 180° AFM DW formed, and (d) 80 Oe, AFM DW removed. The red and blue arrows indicate the inferred direction of the magnetisation in each layer, with the thick/thin arrows representing the thicker (top) and thinner (bottom) layer respectively.