Fig. 3: Micromagnetic simulations for the incomplete and tubular slyrmion phases.
From: Coexistence of distinct skyrmion phases observed in hybrid ferromagnetic/ferrimagnetic multilayers
a Intial state 1 with a clockwise skyrmion spin texture imposed in the bottom and top skyrmion (SK) layers but not in the ferrimagnetic (Fi) layer. b, c Final state 1 and its corresponding cross-section after relaxation of the initial state 1. A skyrmion spin texture exists solely in the sublayers B1 to B4 of the bottom SK layer and in all sublayers of the top SK layer, but not in the Fi layer. d Initial state 2 with a skyrmion spin texture enforced in all layers. e, f Final state 2 and its corresponding cross-section: a tubular skyrmion running through all layers is stabilized. The colors refer to the z-component of the normalized magnetization (blue-negative and red-positive).
