5 papers
Weaving Hopfions from Emergent Monopoles in a Chiral Magnet
Shoya Kasai, Kotaro Shimizu, Shun Okumura +1
Recent advances in three-dimensional magnetization imaging techniques have opened new avenues for exploring topological spin textures beyond domain walls and skyrmions. Among them,…
Creating and Driving a Twist Soliton on a Magnetic Skyrmion Tube
Shoya Kasai, Kotaro Shimizu, Shun Okumura +1
A magnetic skyrmion tube is a three-dimensional topological soliton formed by stacking two-dimensional skyrmions along the out-of-plane direction. Recent real-space observations of…
Nonequilibrium dynamics of magnetic hopfions driven by spin-orbit torque
Shoya Kasai, Shun Okumura, Yukitoshi Motome
Hopfions--three-dimensional topological solitons with knotted spin texture--have recently garnered attention in topological magnetism due to their unique topology characterized by…
Controlling Knot Topology in Magnetic Hopfions via Spin-orbit Torque
Shoya Kasai, Shun Okumura, Yukitoshi Motome
Knots, characterized by topological invariants called the Hopf number , arise from the intertwining of strings and exhibit diverse configurations. The knot structures have recen…
Three-dimensional Topological Superstructure of Magnetic Hopfions Threaded by Meron Strings in Easy-plane Magnets
Shoya Kasai, Kotaro Shimizu, Shun Okumura +2
Topological spin textures exhibit a hierarchical nature. For instance, magnetic skyrmions, which possess a particle-like nature, can aggregate to form superstructures such as skyrm…