Graphene based microwave signal generators

Important results from the project

Objectives: The project aims to demonstrate, understand, and optimize focusing of spin currents in graphene, and then use this fundamental phenomenon to actively control the ferromagnetic resonance of nanomagnets and the frequency of spintronic oscillators. Fulfillment: The goals are largely met. We particularly for the first time demonstrated that we can actively control the ferromagnetic resonance of nanomagnets, both in terms of frequency tunability and linewidth. This now proven phenomenon will be the basis for our spintronic oscillators.

Expected long term effects

The project idea is to exploit graphene´s unmatched capabilities in transmitting pure spin currents and using these spin currents to control spintronic nano-oscillators in the microwave frequency range. For the very first time we have demonstrated the ability to control the ferromagnetic resonance of nanomagnets using spin currents in graphene. We now move forward with the development of oscillators. These have an enormous potential to revolutionize the way broadband (1-100 GHz) microwave signals can be generated, modulated and detected in the graphene based electronics.

Approach and implementation

The project has been led by Sweden´s leading SME in development of spintronic devices and has brought together Sweden´s strongest players in spin currents in graphene (Chalmers) and spintronic nano-oscillators (Gothenburg University). The project has been a collaboration between the three parties which all contributed their respective expertise in materials, material characterization, lithography, spin wave measurements and microwave measurements. The cooperation has been very good and also enabled participants to conduct further research in the Graphene Flagship.