Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 57: Focus Session: Spinorbitronics – from efficient charge/spin conversion based on spin-orbit coupling to chiral magnetic skyrmions III (joint session MA/TT)

MA 57.4: Talk

Friday, March 16, 2018, 10:30–10:45, H 1012

Bi-stable skyrmion states in Pt/Co/Ir multilayer nanodots as a switchable information memory — •Mateusz Zelent¹, Michał Mruczkiewicza², Jaroslav Tóbik², Konstantin Guslienko^3,4, and Maciej Krawczyk¹ — ¹Faculty of Physics, Adam Mickiewicz University in Poznan, Poznan, Poland — ²Institute of Electrical Engineering, Slovak Academy of Sciences, Bratislava, Slovakia — ³Depto. Fisica de Materiales, Universidad del País Vasco, UPV/EHU, San Sebastian, Spain — ⁴IKERBASQUE, the Basque Foundation for Science, Bilbao, Spain

The magnetic skyrmion stability was studied numerically in circular Pt/Co/Ir multilayer stacks with perpendicular magnetic anisotropy and interface Dzyaloshinskii-Moriya interaction (DMI). We have found bi-stable system which can be found in one of the two distinct skyrmion states differing in the skyrmion radius. We demonstrated that two skyrmions can be stabilized due to the different mechanism, primary DMI or primary magnetostatic interaction, leading to small and large size skyrmions, respectively. We developed a technique to compute the total energy of magnetic configurations as a function of the skyrmion diameter, which allows us to estimate the potential barrier between stable states and to explain the influence of dipolar energy contribution on bi-stable skyrmion formation in multilayer dot systems and skyrmion formation in general. Our result can open a new route to develop an efficient skyrmion based memory, with information bit coded as a skyrmion's size. Funded from the EU Horizon 2020, G.A. No. 644348.