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TT: Fachverband Tiefe Temperaturen

TT 57: Skyrmions IV (joint session MA/TT)

TT 57.1: Vortrag

Donnerstag, 19. März 2020, 09:30–09:45, POT 6

Exploring the tunability of skyrmion lifetimes in 3D materials — •Markus Hoffmann, Gideon P. Müller, and Stefan Blügel — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

Chiral magnetic skyrmions are of great scientific interests but also of potential relevance in information technology, data storage, processing, and neuromorphic computing. To compete with existing technology, those skyrmions have to fulfill stringent requirements: Long lifetimes at room temperature at small sizes. Therefore, a significant effort of the magnetism community lies on the analysis of the stability of such small skyrmions. One commonly used approach is the calculation of energy barriers by performing LLG and GNEB simulations as well as the determination of the lifetime prefactor by HTST [1]. Up to now, those were mainly performed for skyrmions in 2D systems, i.e. atomic layers. For technological applications, however, the third dimension can play a significant role. Particularly magnetic multilayers as well as exchange biased materials are in the focus of interest for technologically relevant materials. Yet, little is known about the stability of skyrmions in such materials. We therefore performed lifetime calculations within our Spirit code [2] and investigated the tunability of skyrmion lifetimes by effects such as exchange bias or interlayer coupling.

We acknowledge funding from the DARPA TEE program through grant MIPR (#HR0011831554) from DOI.

[1] P. F. Bessarab et al., Phys. Rev. B 85 (18), 184409 (2012)

[2] Spirit spin simulation framework, spirit-code.github.io