Spintronics discovery reduces low-power memory device costs
In order to utilize electron spins for electronics, or ‘spintronics’’, the method of electrically generating and detecting spins needs to be efficient so the devices can process the spin information with low-power consumption. One way to achieve this is by the spin-Hall effect, which is being researched by scientists who are keen to understand the mechanisms of the effect, but also which materials optimise its efficiency. If research into this effect is successful, it will open the door to new technologies.
The spin-Hall effect helps generate ‘currents’ which enable spin information transfer without the flow of electric charge currents. Unlike other concepts that harness electrons, spin current can transfer information without causing heat from the electric charge, which is a serious problem for current semiconductor devices. Effective use of spins generated by the spin-Hall effect can also revolutionise spin-based memory applications.
The study published in Nature Materials shows how applying an electric field in a common semiconductor material can increase the efficiency of the spin-Hall effect which is key for generating and detecting spin from an electrical input.
The scientists reported a 40-times-larger effect than previously achieved in semiconductor materials, with the largest value measured comparable to a record high value of the spin-Hall effect observed in heavy metals such as Platinum. The study demonstrates that future spintronics might not need to rely on expensive, rare, heavy metals for efficiency, but cheaper materials can be used to process spin information with low-power consumption. The discovery paves the way for the development of a new generation of low-power memory devices.
As there are limited amounts of natural resources in the earth and prices of materials are progressively going up, scientists are looking for more accessible materials with which to develop future sustainable technologies, potentially based on electron spin rather than charge. Added to this, the miniaturisation approach of current semiconductor technology will see a point when the trend, predicted by Moore’s law, will come to an end because transistors are as small as atoms and cannot be shrunk any further. To address this, fundamentally new concepts for electronics will be needed to produce commercially viable alternatives which meet demands for ever-growing computing power.
Lead author of the study, Dr Hidekazu Kurebayashi (UCL London Centre for Nanotechnology), explained: “We borrowed 50 year old semiconductor phenomena for our modern spintronic research. Our results are the start of the story but are a proof of principle with a promising future for spins; as we know that there is existing matured semiconductor growth technology, we can stand on the shoulders of the giants.”
The international research team included scientists from UCL and University of Cambridge in the UK, Mainz University in Germany, the Institute of Physic of the Academy of Sciences in Czech Republic, and Tohoku University in Japan.
Related articles and links:
Research paper in Nature Materials
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