Scientists develop a metamaterial for applications in magnonics, an alternative to conventional electronics

phys.org | 7/10/2019 | Staff
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Physicists from Russia and Europe have demonstrated the real possibility of using superconductor/ferromagnet systems to create magnonic crystals, which will be at the core of spin-wave devices to come in the post-silicon era of electronics. The paper was published in the journal Advanced Science.

Magnonics investigates the possibilities of using spin waves to transmit and process information. Whereas photonics deals with photons and electromagnetic waves, the focus of magnonics is on spin waves, or magnons, which are harmonic oscillations of the orientation of magnetic moments. In ferromagnetic materials, the magnetic moments of the electrons, i.e., their spins, are aligned in a magnetic field. The waves of spin alignment observed in a magnetic system are called spin waves.

Magnonics - Research - Area - Wave - Electronics

Magnonics is seen as a promising research area in post-silicon wave electronics, as spin waves have a number of advantages over, say, microwave photons. For instance, spin waves can be controlled by an external magnetic field. Microwaves, which are essentially electromagnetic waves, have an average wavelength of one centimeter, whereas spin waves in the same microwave frequency range have wavelengths of micrometers. This is why these controllable waves can be used to build very compact microdevices for microwave signals.

Magnonic crystals are the most fundamental systems (sometimes referred to as the building blocks) required to build a device that operates using spin wave signals. These crystals have a wide range of potential applications and will lie at the heart of frequency filters, grating couplers, waveguides, and magnonic devices, which are analogs of transistors.

Authors - Study - Hypothesis - Crystal - Ferromagnet/superconductor

The authors of this study tested their basic hypothesis, which was as follows: Can a magnonic crystal be created using a ferromagnet/superconductor hybrid system? Ferromagnetism and superconductivity are two antagonistic phenomena. In a superconductor, the spins of the electrons bound into a Cooper pair are oriented in opposite directions, whereas in ferromagnets, they tend...
(Excerpt) Read more at: phys.org
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