{"id":554,"date":"2020-01-23T12:51:44","date_gmt":"2020-01-23T17:51:44","guid":{"rendered":"http:\/\/www.potentialloops.org\/?p=554"},"modified":"2020-01-27T09:17:44","modified_gmt":"2020-01-27T03:47:44","slug":"toward-more-efficient-computing-with-magnetic-waves","status":"publish","type":"post","link":"https:\/\/www.potentialloops.org\/?p=554","title":{"rendered":"Toward more efficient computing, with magnetic waves"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n
Circuit design offers a path to ‘spintronic’ devices that use little electricity and generate practically no heat Date: November 28, 2019 <\/h6>\n\n\n\n
Source: Massachusetts Institute of Technology<\/h6>\n\n\n\n
Summary: Researchers have devised a novel circuit design that enables precise control of computing with magnetic waves — with no electricity needed. The advance takes a step toward practical magnetic-based devices, which have the potential to compute far more efficiently than electronics.<\/h6>\n\n\n\n

MIT researchers have devised a novel circuit \ndesign that enables precise control of computing with magnetic waves — \nwith no electricity needed. The advance takes a step toward practical \nmagnetic-based devices, which have the potential to compute far more \nefficiently than electronics.<\/p>\n\n\n\n

Classical computers rely on massive amounts of electricity for \ncomputing and data storage, and generate a lot of wasted heat. In search\n of more efficient alternatives, researchers have started designing \nmagnetic-based “spintronic” devices, which use relatively little \nelectricity and generate practically no heat.<\/p>\n\n\n\n

Spintronic devices leverage the “spin wave” — a quantum property of \nelectrons — in magnetic materials with a lattice structure. This \napproach involves modulating the spin wave properties to produce some \nmeasurable output that can be correlated to computation. Until now, \nmodulating spin waves has required injected electrical currents using \nbulky components that can cause signal noise and effectively negate any \ninherent performance gains.<\/p>\n\n\n\n

The MIT researchers developed a circuit architecture that uses only a\n nanometer-wide domain wall in layered nanofilms of magnetic material to\n modulate a passing spin wave, without any extra components or \nelectrical current. In turn, the spin wave can be tuned to control the \nlocation of the wall, as needed. This provides precise control of two \nchanging spin wave states, which correspond to the 1s and 0s used in \nclassical computing.<\/p>\n\n\n\n

In the future, pairs of spin waves could be fed into the circuit \nthrough dual channels, modulated for different properties, and combined \nto generate some measurable quantum interference — similar to how \nphoton wave interference is used for quantum computing. Researchers \nhypothesize that such interference-based spintronic devices, like \nquantum computers, could execute highly complex tasks that conventional \ncomputers struggle with.<\/p>\n\n\n\n

“People are beginning to look for computing beyond silicon. Wave \ncomputing is a promising alternative,” says Luqiao Liu, a professor in \nthe Department of Electrical Engineering and Computer Science (EECS) and\n principal investigator of the Spintronic Material and Device Group in \nthe Research Laboratory of Electronics. “By using this narrow domain \nwall, we can modulate the spin wave and create these two separate \nstates, without any real energy costs. We just rely on spin waves and \nintrinsic magnetic material.”<\/p>\n\n\n\n

Joining Liu on the paper are Jiahao Han, Pengxiang Zhang, and Justin \nT. Hou, three graduate students in the Spintronic Material and Device \nGroup; and EECS postdoc Saima A. Siddiqui.<\/p>\n\n\n\n

Flipping magnons<\/strong><\/p>\n\n\n\n

Spin waves are ripples of energy with small wavelengths. Chunks of \nthe spin wave, which are essentially the collective spin of many \nelectrons, are called magnons. While magnons are not true particles, \nlike individual electrons, they can be measured similarly for computing \napplications.<\/p>\n\n\n\n

In their work, the researchers utilized a customized “magnetic domain\n wall,” a nanometer-sized barrier between two neighboring magnetic \nstructures. They layered a pattern of cobalt\/nickel nanofilms — each a \nfew atoms thick — with certain desirable magnetic properties that can \nhandle a high volume of spin waves. Then they placed the wall in the \nmiddle of a magnetic material with a special lattice structure, and \nincorporated the system into a circuit.<\/p>\n\n\n\n

On one side of the circuit, the researchers excited constant spin \nwaves in the material. As the wave passes through the wall, its magnons \nimmediately spin in the opposite direction: Magnons in the first region \nspin north, while those in the second region — past the wall — spin \nsouth. This causes the dramatic shift in the wave’s phase (angle) and \nslight decrease in magnitude (power).<\/p>\n\n\n\n

In experiments, the researchers placed a separate antenna on the opposite side of the circuit, that detects and transmits an output signal. Results indicated that, at its output state, the phase of the input wave flipped 180 degrees. The wave’s magnitude — measured from highest to lowest peak — had also decreased by a significant amount.<\/p>\n\n\n\n

Story Source:<\/strong> Materials<\/a> provided by Massachusetts Institute of Technology<\/strong><\/a>. Original written by Rob Matheson. Note: Content may be edited for style and length.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Circuit design offers a path to ‘spintronic’ devices that use little electricity and generate practically no heat Date: November 28, 2019 Source: Massachusetts Institute of Technology Summary: Researchers have devised a novel circuit design that enables precise control of computing with magnetic waves — with no electricity needed. 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