From Event: SPIE Nanoscience + Engineering, 2019
In the last decade, two revolutionary concepts in nano magnetism emerged from research for advanced information processing and storage technologies. The first suggests the use of magnetic domain walls (DWs) in ferromagnetic nanowires to permanently store information in DW race-track memories. The second proposes a hard- ware realisation of neuromorphic computing in nanomagnets using nonlinear magnetic oscillations in the GHz range. Both ideas originate from the transfer of angular momentum from conduction electrons to localised spins in ferromagnets, either to push data encoded in DWs along nanowires or to sustain magnetic oscillations in artificial neurones. Even though both concepts share a common ground, they live on very different time scales which rendered them incompatible so far. Here, we bridge both ideas by demonstrating the excitation of magnetic auto-oscillations inside nano-scale DWs using pure spin currents.
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Nana Nishida, Katrin Schultheiss, Lukas Körber, Norbert Puwenberg, Thomas Mühl, Ahmad A. Awad, Sri Sai Phani Kanth Arekapudi, Olav Hellwig, Jürgen Fassbender, and Helmut Schultheiss, "Domain wall based spin-Hall nano-oscillators (Conference Presentation)," Proc. SPIE 11090, Spintronics XII, 110901Q (Presented at SPIE Nanoscience + Engineering: August 13, 2019; Published: 10 September 2019); https://doi.org/10.1117/12.2528098.6083789796001.