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- Title
Easy-plane spin Hall oscillator.
- Authors
Montoya, Eric Arturo; Khan, Amanatullah; Safranski, Christopher; Smith, Andrew; Krivorotov, Ilya N.
- Abstract
Spin Hall oscillators (SHOs) based on bilayers of a ferromagnet (FM) and a non-magnetic heavy metal (HM) are electrically tunable nanoscale microwave signal generators. Achieving high output power in SHOs requires driving large-amplitude magnetization dynamics by a direct spin Hall current. Here we present an SHO engineered to have easy-plane magnetic anisotropy oriented normal to the bilayer plane, enabling large-amplitude easy-plane dynamics driven by spin Hall current. Our experiments and micromagnetic simulations demonstrate that the easy-plane anisotropy can be achieved by tuning the magnetic shape anisotropy and perpendicular magnetic anisotropy in a nanowire SHO, leading to a significant enhancement of the generated microwave power. The easy-plane SHO experimentally demonstrated here is an ideal candidate for realization of a spintronic spiking neuron. Our results provide an approach to design of high-power SHOs for wireless communications, neuromorphic computing, and microwave assisted magnetic recording. Magnetic oscillators with easy plane magnetic anisotropy hold promise for spintronic applications as nanoscale microwave generators, sources of spin supercurrents and ultrafast spiking neurons. The authors report the experimental realization of an easy-plane ferromagnetic spin-Hall oscillator, where the magnetization exhibits persistent auto-oscillations with a very large precession cone angle.
- Subjects
NANOWIRES; PERPENDICULAR magnetic anisotropy; MAGNETIC anisotropy; SIGNAL generators; WIRELESS communications; MAGNETIZATION
- Publication
Communications Physics, 2023, Vol 6, Issue 1, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-023-01298-7