[23a-E201-1~5] Topological Materials Science for Creation of Innovative Functions

[23a-E201-2] Electric operation of magnetic skyrmions in magnetic thin films

〇Shinya Kasai^1,2 (1.NIMS, 2.JST-PRESTO)

Keywords:magnetic skyrmions, spin-transfer torque

Magnetic skyrmion is a topological spin texture originated from the competition between the exchange interaction and Dzyaloshinskii-Moriya interaction. Skyrmions in bulks can be driven by the electric current through the spin transfer torque with the extremely low threshold current density of 10⁶ A/m². From an application point of view, however, ultrathin magnetic heterostructures are favorable systems rather than bulk magnets because of their compatibility with existing spintronic technologies.
Here we demonstrate the electric operation of the magnetic skyrmions in magnetic thin film heterostructures. The structures of multi-layered films affect not only the formation process of the skyrmions, but also the driving process by electric current. As a results, we can observe some new phenomena in addition to the conventional skyrmion Hall effect. We also mention the materials dependence, and voltage-operation of magnetic skyrmions,