This is the webpage of the Marie Skłodowska-Curie Individual Fellowship project "SWING - Patterning Spin-Wave reconfIgurable Nanodevices for loGics and computing" , by Dr. Edoardo Albisetti, funded by the European Commission in the framework of the Horizon 2020 Programme, Project No 705326.
The project is supervised by Prof. Riccardo Bertacco, from the Department of Physics of Politecnico di Milano, and by Prof. Elisa Riedo, from the Nanoscience Initiative of the CUNY Advanced Science Research Center.
Fridge Magnets. Fridge magnets are made of a ferromagnetic material. What makes a material ferromagnetic is a property of its electrons called spin. Due to the fact that electrons possess a spin, electrons within the material act as tiny magnets. A material is a ferromagnet if these tiny magnets (spins) naturally align in one direction, giving rise to the magnetic force that makes the fridge magnets sticky.
Designing with Spins. What makes magnetic materials extremely interesting is that spins are not fixed and immovable, on the contrary each spin feels the surrounding environment through several complex interactions and reacts by reorienting itself. This means that, by controlling such interactions, it is possible to manipulate the configuration of the spins within the material. Recently, we demonstrated a new amazing way (called tam-SPL) for controlling these interactions. By sweeping an ultra-small “pen” on a magnetic “blackboard”, we are able to write, erase and rewrite the orientation of the spins at will, with a spatial precision thousands of times higher than the width of a human hair. (Press article on the technique, Scientific paper).
Spin waves. In our picture, the ferromagnet is a “sea” of spins interacting with each other. If we throw a “magnetic” stone in this sea, we can generate "ripples" in the orientation of the spins, which propagate within the magnetic material similarly to waves in the water. These waves are called spin-waves, or magnons. The use of spin-waves is envisioned to revolutionize computing, allowing to perform extremely complex calculations in ultra-fast miniaturized computer chips, and to efficiently carry information within integrated magnetic circuits. However, so far, controlling spin-waves with conventional methods has been incredibly challenging.
SWING project aims to design complex magnetic circuits where the propagating spin-waves are confined, controlled and let interact. First, we aim to build a waveguide for spin-waves, by properly designing the spin configuration of the ferromagnet. In such structures, spin-waves will be guided and steered, pretty much like light is guided and steered within optical fibers. Starting from this, we aim to build devices capable of performing basic logic operations by letting multiple spin-waves interact and interfere. Since each spin configuration “written” in the material can be erased and re-written, the functionality of such devices will be fully reconfigurable, on-demand.
Daniela Petti. Politecnico di Milano
Riccardo Bertacco. Politecnico di Milano
Elisa Riedo. New York University (NYU)
Silvia Tacchi. CNR-IOM, Università di Perugia
Marco Madami. CNR-IOM, Università di Perugia
Raffaele Silvani. CNR-IOM, Università di Perugia
Giovanni Carlotti. CNR-IOM, Università di Perugia
Paolo Vavassori. CIC Nanogune
Matteo Pancaldi. CIC Nanogune
Simone Finizio. Paul Scherrer Institute
Sebastian Wintz. Paul Scherrer Institute
Jeorg Raabe. Paul Scherrer Institute
Adam Papp. Pázmány Péter Catholic University
Gyorgy Csaba. Pázmány Péter Catholic University
Wolfgang Porod. Notre Dame
Martin Spieser. SwissLitho
Armin Knoll. IBM Zurich