A team of physicists has taken pictures of a theorized but previously undetected magnetic wave, which offers the potential to be an energy-efficient means to transfer data in electronics. “This is an exciting discovery because it shows that small magnetic waves–known as spin-waves–can add up to a large one in a magnet, a wave that can maintain its shape as it moves,” explains NYU Prof Andrew Kent. “A specialized x-ray method that can focus on particular magnetic elements with very high spatial resolution enabled this discovery and should enable many more insights into this behavior.”
To push the limits of energy efficiency in the future we need to understand better how magnetic devices behave on fast timescales at the nanoscale, which is why we are using this dedicated ultrafast x-ray microscope.” These magnetic waves are solitons- for solitary waves -and were theorized to occur in magnets in the 1970s. They form because of a delicate balance of magnetic forces and could be harnessed to transmit data in magnetic circuits in a way that is far more energy efficient than current methods that involve moving electrical charge.
This is because solitons are stable objects that overcome resistance, or friction, as they move. By contrast, electrons, used to move data today, do generate heat as they travel, due to resistance and thus requiring additional energy, such as from a battery, as they transport data to its destination.
METHOD: They used xray microscopy at the Stanford Synchrotron Radiation Lightsource – using a method akin to the way x-rays are used to image the human body- in order to image the behavior of specific magnetic atoms in materials with high spatial resolution and temporal resolution. The scientists created a condition in magnetic materials where the sought-after solitons should exist by injecting an electrical current into a magnetic material to excite spin-waves.
They observed an abrupt onset of magnetic waves with a well-defined spatial profile that matched the predicted form of a solitary magnetic wave–i.e., a magnetic soliton. http://www.newswise.com/articles/physicists-catch-a-magnetic-wave-that-offers-promise-for-more-energy-efficient-computing
Soliton: Solitary wave in a laboratory wave channel
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