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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteResearchers at the University of California San Diego have demonstrated a way to control magnetic switching by shaping ultrafast laser light—not by changing the magnetic material or applying an external bias field. The September 2026 study used platinum/cobalt multilayers, so the material still matters; the shift is that the beam’s design becomes another control over how magnetization changes.
What did the researchers demonstrate?
In a study published in Nature Communications on 15 September 2026, the team tailored the light’s polarization distribution and focus to control local heating and optical torques in standalone platinum/cobalt multilayers. The paper reports that this enabled control without modifying the material or applying an external bias field. The published article is identified by the journal as an early version that may receive further edits before the final version of record.
UC San Diego describes an experimental structure containing nine alternating platinum and cobalt layers. In this thicker structure, the team demonstrated switching without relying on a particular light polarization, unlike earlier approaches described by the university. That does not mean all observed switching was polarization-independent: the paper distinguishes two different behaviors.
Two distinct switching behaviors
- Helicity-dependent domain-wall propagation: In a multishot process, the light’s helicity—the handedness associated with circular polarization—matters to how a boundary between magnetic regions propagates.
- Helicity-independent magnetization reversal: The researchers also report reversal that does not depend on helicity. It is a distinct outcome, not evidence that one universal switching mechanism covers every result.
UC San Diego explains the pulse sequence in accessible terms: early laser pulses heat a tiny area enough to create a reversed magnetic region; later pulses expand that region until it becomes stable. The study’s key point is that the spatial and polarization pattern of the light can be engineered to influence the local magnetic response.
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What does “the light, not the material” mean?
Magnetic storage represents information through different magnetic orientations. In this experiment, an ultrafast laser acted on a magnetic thin-film stack, and the team designed the beam’s focus and polarization distribution to influence how a region changed state. In that sense, the researchers shifted part of the design problem from inventing or modifying a light-sensitive material to engineering the optical field.
The phrase should not be taken literally: the platinum/cobalt multilayer remains essential, and its magnetic response is what the light controls. The result is a different control strategy, not proof that any material can be switched in the same way. 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.”
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How does this fit into optical magnetic switching?
All-optical control of magnetization is an established research area, not a concept invented in 2026. A 2019 review in Nature Reviews Materials surveyed how ultrashort laser pulses can control magnetization on picosecond-to-femtosecond timescales and discussed the potential for fast, energy-efficient magnetic writing. That field context does not establish that this particular beam-shaping setup is ready for a computer or storage product.
Other work explores different routes. For example, a June 2026 QST-led release described a separate artificial ferrimagnet that switches with a single ultrashort laser pulse. That is a distinct research direction: the UC San Diego study centers on optical beam design in platinum/cobalt multilayers, rather than a direct head-to-head comparison with a new material.
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How much faster could it be?
UC San Diego says the researchers estimate that optical switching could be more than 1,000 times faster than approaches relying on external magnetic fields. This is an estimate about potential switching, not a measured speed benchmark for a commercial drive. The institutional report does not provide consumer-device comparisons or establish how the figure would translate into overall memory performance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why is this not a computer-memory product yet?
The work is a laboratory demonstration in magnetic thin films, not a working memory device, chip feature, or retail storage product. UC San Diego identifies the specialized ultrafast laser used in the experiment as a key integration hurdle: it cannot yet be readily integrated into computer chips. The researchers are investigating ways to shrink the beam and confine light into smaller spaces, but those are future-work goals, not capabilities demonstrated in a product.
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Potential gains in speed, size, or energy efficiency therefore remain prospective. To move from a thin-film experiment toward a practical memory technology, researchers would need to address the light source and confine the optical field at useful scales, as well as show that the switching behavior can be integrated into a functioning device. The published reports do not establish that those steps have been completed.
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What the study changes—and what it does not
- It changes: Beam shape and polarization distribution can be treated as design controls for magnetic switching, rather than relying only on material changes or an external bias field.
- It does not establish: A consumer product, a commercial storage speed, or a universal light-driven switching method that works independently of the magnetic stack.
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