Russian physicists have developed a method for converting acoustic vibrations into high-frequency spin waves suitable for transmitting information in spintronic devices. This was reported by the press service of the Russian Science Foundation.
The study was carried out at the Ioffe Institute of the Russian Academy of Sciences. For the first time, the scientists succeeded in generating spin waves, synchronous oscillations of the magnetic moments of atoms, at room temperature using a sound pulse.
The new approach is significantly simpler than existing analogues and could accelerate the creation of energy-efficient and high-speed computing systems.
The method is based on an analogue of the Vavilov-Cherenkov effect, discovered back in 1934. If a particle moves faster than the speed of light propagation in a medium, radiation arises. A similar principle was implemented for magnetic materials as well.
A key role was played by thin ferrite-garnet films with a gold layer. A laser pulse is converted into an acoustic signal that launches spin waves. Their parameters can be regulated by an external magnetic field, opening the way to flexible tuning of next-generation spintronic chips.
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