Dr. Felix Buettner Profile

Dr. Felix Buettner

at Massachusetts Institute of Technology

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Proceedings Article | 10 September 2019 Presentation

Dynamics of skyrmions and chiral domain walls (Conference Presentation)

Felix Buettner

Proceedings Volume 11090, 110900Y (2019) https://doi.org/10.1117/12.2528885

KEYWORDS: Solitons, Ultrafast phenomena, Nanotechnology, Magnetism, Physics, States of matter, Femtosecond phenomena

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Skyrmions and chiral domain walls are two- and one-dimensional magnetic solitons, respectively. Both can be realized at room temperature using thin layers of simple materials, such as Co, sandwiched between dissimilar spin-orbit materials [1-4]. Both solitons can be described as quasi-particles with intriguing dynamics. Skyrmion dynamics, in particular, exhibit fascinating topological signatures, such as gyration [1], inertia [1], the skyrmion Hall effect [2], and topological damping [3]. Here, I will discuss the ultrafast dynamics of skyrmions and chiral domain walls in response to electrical and optical stimuli. I will present a quantitative analytical model to describe why and how these dynamics differ between in ferromagnets and antiferromagnets [3]. The model predicts ultrasmall skyrmions and ultrafast solitons in chiral antiferromagnets, which is in excellent agreement with our experimental observation of these physics ferrimagnetic chiral Pt/GdCo/TaOx near compensation [5]. I will conclude with a discussion of very recent data on chiral dynamics in the non-equilibrium state of matter after high intensity femtosecond optical excitation. [1] Büttner et al., Nat. Phys. 11, 225 (2015). [2] Litzius et al., Nat. Phys. 13, 170 (2017). [3] Büttner et al., Sci. Rep. 8, 4464 (2018). [4] Büttner et al., Nat. Nanotech. 12, 1040 (2017). [5] Caretta, et al., Nat. Nanotech. 13, 1154 (2018).

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