Scientists have developed a new type of holographic memory device that could provide unprecedented data storage capacity and data processing capabilities in electronic devices.
Researchers from the University of California, Riverside, Bourns College of Engineering and Russian Academy of Science developed a prototype of the new memory device that uses spin waves - a collective oscillation of spins in magnetic materials - instead of the optical beams.
Spin waves are advantageous because spin wave devices are compatible with the conventional electronic devices and may operate at a much shorter wavelength than optical devices, allowing for smaller electronic devices that have greater storage capacity, researchers said.
Experimental results obtained by the team show it is feasible to apply holographic techniques developed in optics to magnetic structures to create a magnonic holographic memory device.
"The results open a new field of research, which may have tremendous impact on the development of new logic and memory devices," said Alexander Khitun, the lead researcher, who is a research professor at UC Riverside.
Holography is a technique based on the wave nature of light which allows the use of wave interference between the object beam and the coherent background.
It is commonly associated with images being made from light, such as on driver's licenses or paper currency. However, this is only a narrow field of holography.
Holography has been recognised as a future data storing technology with unprecedented data storage capacity and ability to write and read a large number of data in a highly parallel manner.
Most of Khitun's initial research was focused on the development of spin wave-based logic circuits similar to the ones currently used in the computers.
A critical moment occurred last year when he decided the device didn't need to replace the computer's electronic circuits.
Instead, the device would complement the circuits, or help them accomplish certain tasks, such as image recognition, speech recognition and data processing.
He conducted experiments using a 2-bit magnonic holographic memory prototype device. A pair of magnets, which represent the memory elements, were aligned in different positions on the magnetic waveguides.
Spin waves propagating through the waveguides are affected by the magnetic field produced by the magnets.
When spin waves interference was applied in the experiments, a clear picture was produced and the researchers could recognise the magnetic states of the magnets.
All experiments were done at room temperature.
