Berlin 2018 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 17: Skyrmions III (joint session MA/TT/KFM)
KFM 17.7: Vortrag
Mittwoch, 14. März 2018, 16:30–16:45, EB 301
Internal structure and stability of skyrmions in ferromagnet/heavy-metal multilayers — •Ksenia Chichay1, Joseph Barker2, and Oleg Tretiakov2,3 — 1Center for Functionalized Magnetic Materials (FunMagMa), Immanuel Kant Baltic Federal University, Kaliningrad, Russia — 2Institute for Materials Research, Tohoku University, Sendai, Japan — 3School of Natural Sciences, Far Eastern Federal University, Vladivostok, Russia
Magnetic Skyrmions are one of the fascinating and promising objects because of their small size and stability to perturbations such as electric currents and magnetic fields. The major mechanism to stabilize small skyrmions in ferromagnet/heavy-metal bilayers is the presence of Dzyaloshinskii-Moriya interaction (DMI).
In this work we investigate the stability and internal structure of an isolated skyrmion in bilayer (ferromagnet/heavy metal) and trilayer (heavy metal 1/ferromagnet/heavy metal 2) nanodisks. We study the static properties of the skyrmions and obtain the phase diagrams of the skyrmion existence depending on the thickness of the ferromagnetic layer and the DMI strength. We demonstrate the importance of fully taking into account the dipolar interaction even for a few atomic layers thin nanodisk and that together with DMI it has the stabilizing effect and defines the Skyrmion configuration. For the trilayer structures with two heavy-metal interfaces, we show that the type and configuration of the skyrmion can be controlled by the thickness of ferromagnet. Furthermore, the interplay of two interfacial DMIs can lead to the formation of magnetic structures with higher winding number.