Spin–orbit torque nano-oscillator with giant magnetoresistance readout
| Autor: | Ilya Krivorotov, Andrew Smith, Jia Grace Lu, Jen-Ru Chen, Eric Montoya |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Magnetoresistance Spintronics business.industry General Physics and Astronomy lcsh:Astrophysics Giant magnetoresistance Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Signal lcsh:QC1-999 Power (physics) Condensed Matter::Materials Science Ferromagnetism lcsh:QB460-466 Optoelectronics Torque Condensed Matter::Strongly Correlated Electrons business lcsh:Physics Microwave |
| Zdroj: | Communications Physics, Vol 3, Iss 1, Pp 1-8 (2020) |
| ISSN: | 2399-3650 |
| Popis: | Spin-orbit torque nano-oscillators based on bilayers of ferromagnetic and nonmagnetic metals are ultra-compact current-controlled microwave signal sources. They are attractive for practical applications such as microwave assisted magnetic recording, neuromorphic computing, and chip-to-chip wireless communications. However, a major drawback of these devices is low output microwave power arising from the relatively small anisotropic magnetoresistance of the ferromagnetic layer. Here we experimentally show that the output power of a spin-orbit torque nano-oscillator can be significantly enhanced without compromising its structural simplicity. Addition of a ferromagnetic reference layer to the oscillator allows us to employ current-in-plane giant magnetoresistance to boost the output power of the device. This enhancement of the output power is a result of both large magnitude of giant magnetoresistance compared to that of anisotropic magnetoresistance and their different angular dependencies. Our results hold promise for practical applications of spin-orbit torque nano-oscillators. Spin-orbit torque driven oscillators, such as spin Hall oscillators, form a class of devices that are intensively studied due to potential practical applications in spintronics. Here, the authors modify the conventional ferromagnetic/nonmagnetic stack to include an additional ferromagnetic layer and leverage the giant magnetoresistance effect to enhance the direct conversion of an in-plane driving current into the microwave output signal. |
| Databáze: | OpenAIRE |
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