Fig. 1: Experimental design for the conversion between skyrmion and skyrmionium.
From: Reversible conversion between skyrmions and skyrmioniums
a Schematic diagram of the Ta(3)/[Pt(0.5)/Co(0.5)]3/Ru(2)/[Co(0.5)/Pt(0.5)]3/Ta(3) multilayers. Numbers in parentheses represent thicknesses in nanometers. The sequent current pulses are injected into the Hall bar along +x by default. The Hall bar is 20 μm in width and 120 μm in length. b The schematic diagrams of a Q = 1 skyrmion, a Q = 0 skyrmionium and a Q = −1 skyrmion. The violet arrows connect the chiral domain wall with the same orientation between the skyrmion and the skyrmionium. c The evolution from skyrmions to skyrmion bags, and then to a Q = −1 skyrmion.
