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TT: Fachverband Tiefe Temperaturen

TT 76: Focus Session: Curvilinear magnetism: Magnetics with nanoscale curved geometries (joint session MA/TT)

TT 76.1: Hauptvortrag

Donnerstag, 12. März 2026, 09:30–10:00, POT/0151

2D and 3D racetracks: Interplay of geometric and magnetic chiralities — •Stuart Parkin — Max Planck Institute for Microstructure Physics, Halle (Saale), Germany — Martin Luther University Halle-Wittenberg

Magnetic Racetrack Memory (RTM) is a unique memory-storage device that relies on the current driven motion of multiple domain walls along magnetic conduits that can be arranged either horizontally (2D) or vertically (3D). It has great potential as a high performance, non-volatile memory that has enormous data storage capacity compared to today*s memory technologies. Atomically engineered 2D magnetic racetracks in the form of synthetic antiferromagnets allow for very high current induced motion of nanoscopic chiral domain walls[1]. Recently we have shown that 2D RTM can be scaled to dimensions that are technologically relevant with widths of just ~50 nm[2]. 3D racetracks would allow for the highest density memories. Using a state-of-the-art multi-photon super-resolution lithography system we form 3D scaffolds of arbitrary shapes on which the racetracks can be subsequently deposited. We discuss 3D racetracks that are formed with clockwise and anticlockwise chiral twists and curved cross-sections. The interplay between the geometrical chirality and the spin chirality of the individual domain walls allows for domain wall diode devices [3]. [1] S. S. P. Parkin, S.-H. Yang, Nat. Nanotechnol. 2015, 10, 195. [2] J.-C. Jeon, A. Migliorini, J. Yoon, J. Jeong, S. S. P. Parkin, Science 2024, 386, 315. [3] A. M. A. Farinha, S.-H. Yang, J. Yoon, B. Pal, S. S. P. Parkin, Nature 2025, 639, 67.

Keywords: 3D structure; chiral structure; racetrack memory; chiral spin texture; domain wall