Spin–orbit torque nano-oscillator with giant magnetoresistance readout
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 23, 2020
- Source ID
- 10.1038/s42005-020-00454-7
Entities
People
- Andrew N. Smith
- Eric Arturo Montoya
- Ilya Krivorotov
- Jen-ru Chen
- Jia Grace Lu
Organizations
- Army Research Office
- Defense Threat Reduction Agency
- National Science Foundation
- University of California