Fig. 1: Dipolar SKs and ASKs of arbitrary topological charge.
From: Dipolar skyrmions and antiskyrmions of arbitrary topological charge at room temperature
a–k, Spin configurations of dipolar-stabilized SKs with topological charges Q = 0 (a), Q = −1 (b), Q = −2 (c), Q = −3 (d), Q = −4 (e) and Q = −5 (f), and ASKs with Q = 1 (g), Q = 2 (h), Q = 3 (i), Q = 4 (j) and Q = 5 (k). l,m, The ASKs are defined using the coordinates system in l, and the counterclockwise rotation of the magnetization along the soliton boundary depicted in m (left), whereas the SKs are defined by a clockwise rotation of magnetization (right). The colour of arrows is given by the colour wheel in q. n,o, Dependence of the energy ESK of SKs (left) and ASKs (right) of higher charge (with respect to the energy EFM of the ferromagnetic state) on the applied OOP magnetic field (n), from which the dependence between the (A)SK energy and topological charge (o) is obtained using values at a fixed magnetic field (μ0Hz = 15 mT). p,q, The performed large-scale magnetic simulations are illustrated using the calculated underfocused LTEM image (p) and the magnetic induction map (q), disclosing the coexistence of SKs and ASKs with arbitrary topological charge. Scale bar, 1 µm.
