Max Planck Institute for Microstructure Physics, Halle (Saale), Germany

Abstract：

Spintronics allows for advanced memory and storage technologies that go beyond today’s charge-based devices. Of especial interest is Magnetic Racetrack Memory (RTM) that is a unique memory-storage device that relies on the current driven motion of domain walls along magnetic conduits. Racetrack Memory has evolved in several distinct stages, that we have dubbed version 1.0-4.0. In version 4.0 we have shown that chiral domain walls can be driven at speeds exceeding 1 km/s in synthetic antiferromagnetic racetracks by spin currents generated via the spin Hall effect in proximal metallic layers. The scaling of 2D racetrack conduits to sub 80 nm wide dimensions is presented and the use of integrated anomalous Hall read sensors that allow for the detection of domain walls with ~10 nm spatial resolution is described. We discuss several schemes for building prototype 3D racetracks. In one case freestanding membranes composed of atomically engineered thin film heterostructures that form the racetrack are formed on a sacrificial water-soluble sacrificial release layer. The freestanding membranes are transferred onto protrusions that have been pre-patterned on sapphire wafers to create 3D racetracks. In a second approach we fabricate 3D chiral magnetic racetracks via a novel state-of-the-art multi-photon super-resolution lithography system. We show how the interplay between the geometrical chirality and the spin chirality of the individual domain walls allows for domain wall diode devices. Finally, we discuss the possibility of creating a novel cryogenic Racetrack Memory (version 5.0) using triplet supercurrents created by proximity induced superconductivity in various magnetic and non-magnetic layers and by sensors based on the Josephson Diode effect.

Brief CV of Prof. Dr. Stuart Parkin:

Stuart Parkin received his B.A. in Physics and Theoretical Physics in 1977 and his Ph.D. in 1980 from the University of Cambridge, UK. His research interests include spintronic materials and devices for advanced sensor, memory, and logic applications, oxide thin-film heterostructures, topological metals, exotic superconductors, and cognitive devices.He is an elected Fellow or Member: Royal Society (London), Royal Academy of Engineering, National Academy of Sciences, National Academy of Engineering, German National Academy of Science - Leopoldina, Royal Society of Edinburgh, Indian Academy of Sciences, and TWAS - academy of sciences for the developing world. His awards include the American Physical Society International Prize for New Materials (1994); Europhysics Prize for Outstanding Achievement in Solid State Physics (1997); 2009 IUPAP Magnetism Prize and Neel Medal; 2012 von Hippel Award - Materials Research Society; 2013 Swan Medal - Institute of Physics (London); Alexander von Humboldt Professorship − International Award for Research (2014); Millennium Technology Award (2014); ERC Advanced Grant - SORBET (2015); King Faisal Prize for Science 2021; ERC Advanced Grant – SUPERMINT (2022); 2024 APS Medal for Exceptional Achievement in Research; and 2024 Charles Stark Draper Prize of the National Academy of Engineering. He has received 4 honorary doctorates. He has published over700 papers, has over 128 issued patents, and has given over 1,000 invited talks around the world. He has an H-index of 136. Prof. Parkin was named a “Highly Cited Researcher” for the years 2018-2024 and a Citation Laureate™ for 2023 by Clarivate.

主持人：靳常青 研究员

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