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HZB Talk - Felix Büttner

Dec 20, 2019 | 10:00 AM

The TRR 227 kindly invites you to the the following HZB talk.

Speaker: Dr. Felix Büttner - Department of Materials Science and Engineering, Massachusetts Institute of Technology (MIT)

Title: Controlling and imaging of nanoscale topological spin textures


Can we control the atomic arrangement of spins in a material and can we do so locally and dynamically? This question is of large practical relevance for technological applications ranging from data storage devices to quantum computers. Of particular importance in this context are stable spin textures, so-called solitons, because they allow the freezing-out of an excited spin state for timescales on the order of decades. The smallest of such solitonic spin states is a magnetic skyrmion, which is a nanoscale topological knot in the material's spin system. In this talk, I will give an overview of my research in the field of room-temperature skyrmion physics, including a theoretical background of how skyrmions are stabilized [1], strategies of how the size of room-temperature skyrmions can be reduced to ~10 nm [1,2], and a discussion of how to create and displace skyrmions on sub-ns timescales [3-5]. Direct x-ray imaging of skyrmions with high spatial and temporal resolution has been key to all of these developments, as will be discussed in this talk. As an outlook, I will present first results of skyrmion dynamics in the far-from-equilibrium state after optical excitation with extremely bright femtosecond laser pulses and discuss the perspective to apply the imaging and control of local spin textures to correlated antiferromagnetic materials.

[1] Büttner et al., Sci. Rep.8, 4464 (2018).
[2] Caretta, Mann, Büttner et al., Nat. Nanotech.13, 1154 (2018).
[3] Büttner et al., Nat. Phys.11, 225 (2015).
[4] Litzius et al., Nat. Phys.13, 170 (2017).
[5] Büttner et al., Nat. Nanotech.12, 1040 (2017).

Time & Location

Dec 20, 2019 | 10:00 AM

WCRC Adlershof Hörsaal / Lecture Hall
(Albert-Einstein-Straße 15, 12489 Berlin)