Vals AI's 90 Claude Opus 5.5 Agents Name Two Magnetic Semiconductor Candidates, Neither Yet Measured
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Vals AI's 90 Claude Opus 5.5 Agents Name Two Magnetic Semiconductor Candidates, Neither Yet Measured
One candidate was first synthesised in 1999 and has a measured ordering temperature of 376 K. The other may not survive the furnace.
Vals AI said on October 4 that a team of about 90 agents built on Claude Opus 5.5 produced two candidate materials for room-temperature magnetic semiconductors, after roughly 750 density functional theory jobs. Neither has been measured in a lab.
The Vals AI report was written by Geby Jaff. Its own closing line is the limit of the claim: "The next step is to make KV[Cr(CN₆)] again and measure its spin sorting directly."
What the agents were asked to find
The search targeted a class the report calls Luttinger-compensated antiferromagnets. In these materials opposing spin-up and spin-down atoms cancel magnetically while sitting in inequivalent positions, so electrons can still be sorted by spin.
The target use is spintronic memory. The agents ran their simulations at two levels of theory, PBE+U and HSE06.
AlphaSignal, which summarised the work separately, said the jobs ran in Quantum ESPRESSO on Modal cloud CPUs, with adversarial referee reviews between steps. Vals did not disclose the cost in the material reviewed here.
The two candidates
| YBaMnFeO₅ | KV[Cr(CN₆)] | |
|---|---|---|
| Origin | Newly designed oxide | First synthesised in 1999 |
| Predicted band gap | 2.35 eV | 2.1 eV |
| Ordering temperature | About 420 K raw, 490 K calibrated (predicted) | 376 K (measured) |
| Main risk | Mn-Fe checkerboard destabilises above 950 K | Water in the 1999 sample |
The designed oxide has spin windows of 1.0 eV for holes and 1.4 eV for electrons. The older compound has 2.6 eV and 1.6 eV. All of these are computed values.
Why one candidate may never be made
The oxide needs manganese and iron in an ordered checkerboard. Vals said that arrangement breaks down above 950 K, while standard oxide processing runs between 900 and 1300 degrees Celsius.
The cyanide compound avoids this because chromium and vanadium sit on distinct, locked sites. It also has a measurement behind it: magnetic ordering up to 376 K, which is 103 degrees Celsius.
The part the 1999 sample complicates
The powder sample from 1999 contained water and showed a residual moment of 0.125 Bohr magnetons, where an ideal compensated magnet would show zero. The report said its two simulation methods disagreed on whether water leaves the spin sorting intact.
That disagreement is the finding a reader would miss from a headline. The agents flagged a compound that had sat in the literature for 27 years, and also surfaced the one experimental detail that undercuts it.
Vals published a GitHub ledger with input files, analysis scripts and documented caveats, which lets others rerun the calculations.
What it says about agent claims
The model's maker was not the author. Vals AI ran the agents and wrote the report, so the capability claim rests on a third party's account and a public ledger rather than an Anthropic announcement.
The agents did literature review and simulation. They did not synthesise anything. Other agent stories this week ran the other way, such as Wikimedia's account of OpenAI agents editing its wikis and the Claude diary entry sent to police, where outputs reached people.
The next milestone is a lab. Vals said the plan is to remake KV[Cr(CN₆)] and measure it, and no result date has been given.
Sources
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