Dataset Information

Deterministic Generation and Guided Motion of Magnetic Skyrmions by Focused He⁺-Ion Irradiation.

ABSTRACT: Magnetic skyrmions are quasiparticles with nontrivial topology, envisioned to play a key role in next-generation data technology while simultaneously attracting fundamental research interest due to their emerging topological charge. In chiral magnetic multilayers, current-generated spin-orbit torques or ultrafast laser excitation can be used to nucleate isolated skyrmions on a picosecond time scale. Both methods, however, produce randomly arranged skyrmions, which inherently limits the precision on the location at which the skyrmions are nucleated. Here, we show that nanopatterning of the anisotropy landscape with a He⁺-ion beam creates well-defined skyrmion nucleation sites, thereby transforming the skyrmion localization into a deterministic process. This approach allows control of individual skyrmion nucleation as well as guided skyrmion motion with nanometer-scale precision, which is pivotal for both future fundamental studies of skyrmion dynamics and applications.

SUBMITTER: Kern LM

PROVIDER: S-EPMC9137908 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature

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Publications

Deterministic Generation and Guided Motion of Magnetic Skyrmions by Focused He<sup>+</sup>-Ion Irradiation.

Kern Lisa-Marie LM Pfau Bastian B Deinhart Victor V Schneider Michael M Klose Christopher C Gerlinger Kathinka K Wittrock Steffen S Engel Dieter D Will Ingo I Günther Christian M CM Liefferink Rein R Mentink Johan H JH Wintz Sebastian S Weigand Markus M Huang Meng-Jie MJ Battistelli Riccardo R Metternich Daniel D Büttner Felix F Höflich Katja K Eisebitt Stefan S

Nano letters 20220516 10

Magnetic skyrmions are quasiparticles with nontrivial topology, envisioned to play a key role in next-generation data technology while simultaneously attracting fundamental research interest due to their emerging topological charge. In chiral magnetic multilayers, current-generated spin-orbit torques or ultrafast laser excitation can be used to nucleate isolated skyrmions on a picosecond time scale. Both methods, however, produce randomly arranged skyrmions, which inherently limits the precision ...[more]

PMID: 35577328

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Project description:BACKGROUND:MR-guided focused ultrasound or high-intensity focused ultrasound (MRgFUS/MRgHIFU) is a non-invasive therapeutic modality with many potential applications in areas such as cancer therapy, drug delivery, and blood-brain barrier opening. However, the large financial costs involved in developing preclinical MRgFUS systems represent a barrier to research groups interested in developing new techniques and applications. We aim to mitigate these challenges by detailing a validated, open-source preclinical MRgFUS system capable of delivering thermal and mechanical FUS in a quantifiable and repeatable manner under real-time MRI guidance. METHODS:A hardware and software package was developed that includes closed-loop feedback controlled thermometry code and CAD drawings for a therapy table designed for a preclinical MRI scanner. For thermal treatments, the modular software uses a proportional integral derivative controller to maintain a precise focal temperature rise in the target given input from MR phase images obtained concurrently. The software computes the required voltage output and transmits it to a FUS transducer that is embedded in the delivery table within the magnet bore. The delivery table holds the FUS transducer, a small animal and its monitoring equipment, and a transmit/receive RF coil. The transducer is coupled to the animal via a water bath and is translatable in two dimensions from outside the magnet. The transducer is driven by a waveform generator and amplifier controlled by real-time software in Matlab. MR acoustic radiation force imaging is also implemented to confirm the position of the focus for mechanical and thermal treatments. RESULTS:The system was validated in tissue-mimicking phantoms and in vivo during murine tumor hyperthermia treatments. Sonications were successfully controlled over a range of temperatures and thermal doses for up to 20 min with minimal temperature overshoot. MR thermometry was validated with an optical temperature probe, and focus visualization was achieved with acoustic radiation force imaging. CONCLUSIONS:We developed an MRgFUS platform for small-animal treatments that robustly delivers accurate, precise, and controllable sonications over extended time periods. This system is an open source and could increase the availability of low-cost small-animal systems to interdisciplinary researchers seeking to develop new MRgFUS applications and technology.

Dataset Information

Deterministic Generation and Guided Motion of Magnetic Skyrmions by Focused He⁺-Ion Irradiation.

Publications

Deterministic Generation and Guided Motion of Magnetic Skyrmions by Focused He<sup>+</sup>-Ion Irradiation.

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Dataset Information

Deterministic Generation and Guided Motion of Magnetic Skyrmions by Focused He+-Ion Irradiation.

Publications

Deterministic Generation and Guided Motion of Magnetic Skyrmions by Focused He<sup>+</sup>-Ion Irradiation.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets

Deterministic Generation and Guided Motion of Magnetic Skyrmions by Focused He⁺-Ion Irradiation.