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1 PublicationBipolar spin Hall nano-oscillators
Hache, T.; Li, Y.; Weinhold, T.; Scheumann, B.; Trindade Goncalves, F. J.; Hellwig, O.; Faßbender, J.; Schultheiß, H.
Abstract
We demonstrate a novel type of spin Hall nano-oscillators (SHNOs) that allow for efficient tuning of magnetic auto-oscillations over an extended range of gigahertz frequencies, using bipolar direct currents at constant magnetic elds. This is achieved by stacking two distinct magnetic materials with a platinum layer in between. In this device, the orientation of the spin polarised electrons accumulated at the top and bottom interfaces of platinum is switched upon changing the polarity of the direct current. As a result, the effective anti-damping required to drive large amplitude auto-oscillations can appear either at the top or bottom magnetic layer. Tuning of the auto-oscillation frequencies by several gigahertz can be obtained by combining two materials with sufficiently different saturation magnetization. Here we show that the combination of NiFe and CoFeB can result in 3 GHz shifts in the auto-oscillation frequencies. Bipolar SHNOs as such may bring enhanced synchronisation capabilities to neuromorphic applications.
Involved research facilities
- Ion Beam Center DOI: 10.17815/jlsrf-3-159
Related publications
- DOI: 10.17815/jlsrf-3-159 is cited by this (Id 30829) publication
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Bipolar spin Hall nano-oscillators
ROBIS: 30822 has used this (Id 30829) publication of HZDR-primary research data
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Reseach data in the HZDR data repository RODARE
Publication date: 2020-03-18 Open access
DOI: 10.14278/rodare.269
Versions: 10.14278/rodare.270
License: CC-BY-4.0
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Permalink: https://www.hzdr.de/publications/Publ-30829