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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Researchers at the University of California San Diego have shown that shaping ultrafast laser light can control magnetization in platinum-cobalt multilayers—without changing the material or applying an external bias field. The result shifts part of the design challenge from engineering a new magnetic material to engineering the light that acts on it. It is a laboratory demonstration, not a new kind of computer memory ready for consumers.
What the researchers changed
Magnetic storage encodes information through different magnetic orientations. In the UC San Diego study, the team used an ultrafast laser and tailored the light’s spatial polarization pattern and focus to influence how regions of a magnetic film changed state. The paper reports that this let the researchers control local heating and optical torques in stand-alone platinum/cobalt multilayers without modifying the material or using an external bias field. Nature Communications
The material still matters: the experiment depended on the magnetic response of a specific platinum/cobalt stack. The change is in the control strategy. Rather than making a new light-sensitive material the central intervention, the team designed the optical beam to produce desired switching behavior. Study senior author Abdoulaye Ndao, a UC San Diego professor, summarized the approach: “Instead of designing a new material to enable optical switching, we redesigned the light itself and showed new properties that were not previously thought to be possible.” UC San Diego
Two distinct magnetic responses
The study reports more than one outcome, so its result should not be reduced to a single claim that “light flips bits.” One behavior was helicity-dependent, multishot domain-wall propagation; another was helicity-independent magnetization reversal. These are distinct switching behaviors achieved through optical control, not interchangeable descriptions of one universal mechanism. Nature Communications
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What happened across the pulse sequence
UC San Diego describes the process as a sequence: early laser pulses heat a tiny region enough to create a reversed magnetic area, and later pulses expand that area until it becomes stable. The university also reports that the team demonstrated switching in a thicker sample made from nine alternating platinum and cobalt layers, without relying on a particular light polarization as earlier work did. UC San Diego
Why the speed claim needs context
UC San Diego says the researchers estimate optical switching could be more than 1,000 times faster than approaches that rely on external magnetic fields. That is an estimate about the potential speed advantage of optical switching—not a measured commercial-drive benchmark, and not evidence that a storage device using this method has achieved that performance. UC San Diego
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Ultrafast optical control has been studied for years. A 2019 review discussed magnetization control with ultrashort laser pulses on picosecond-to-femtosecond timescales and surveyed the possible use of all-optical switching for fast, energy-efficient magnetic writing. That broader field context does not establish that the 2026 setup is ready for practical storage. Nature Reviews Materials
What this does—and does not—mean for computer memory
The work is an experimental demonstration in magnetic thin films, not a memory product, chip feature, or retail storage device. UC San Diego identifies the specialized ultrafast laser as a barrier to integrating the technique into computer chips. The team is investigating how to shrink the beam and confine light into smaller spaces; those are future research directions, not capabilities demonstrated in a consumer device. UC San Diego
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Faster, smaller, or more energy-efficient magnetic writing remains a potential benefit, not a result established for a working drive. Moving from a thin-film experiment to useful memory would require solving the laser and light-confinement challenges, as well as demonstrating a practical integrated system.
How this differs from other light-controlled magnetism research
Not all laser-switching research changes the same part of the system. A separate June 2026 report from Japan’s National Institutes for Quantum Science and Technology described an artificial ferrimagnet that switches with a single ultrashort laser pulse. That is a different research direction, centered on the material, rather than a direct head-to-head comparison with UC San Diego’s beam-shaping experiment. QST
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An earlier University of Chicago report on MnBi2Te4 described light-sensitive magnetic behavior and, at the time, framed laser manipulation as planned future work. It should not be confused with the 2026 platinum/cobalt experiment, whose distinguishing intervention was optical beam design. University of Chicago
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Where the study stands
The Nature Communications article page lists publication on 15 September 2026 and describes the published article as an early version that may receive further edits before the final version of record. Nature Communications The supported takeaway is specific: the team demonstrated that engineering an ultrafast beam can shape switching behavior in a platinum/cobalt multilayer. Whether that control can be made compact and practical enough for on-chip storage remains unresolved.
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