Materials switch under a pulse and reveal themselves through chemistry
Shaped magnetic pulses computationally lower memory energy while chemical traces resolve Rivera's mural; the two studies read material behaviour toward the future and the past.
Science··Morning
The pulse searches for the lowest-energy route
The magnetic-memory study searches for how to change a material by calculating the pulse shape. A group at the University of Edinburgh applies optimal control theory to design ultrafast field pulses that reverse magnetisation in van der Waals monolayers, reporting energies several orders of magnitude below current memory technologies. The paper, by Mohammad H. Badarneh and colleagues under Elton Santos at Edinburgh's Institute for Condensed Matter and Complex Systems, was published online in Advanced Materials on 14 July, with the university announcement following on 31 July. The comparison baselines are DRAM, STT-MRAM and the newer SOT-MRAM, and the authors describe the resulting energies as approaching the Landauer limit, the thermal floor for processing a single bit. The work is entirely computational; no device was built or measured. The authors present the framework as practical guidance for later implementation and note that extending the mathematics to electrical currents and laser pulses has not been attempted.[1]
Chemistry tested the historical recipe
The Rivera mural study reconstructs how a material was made by applying several chemical methods to very small samples. Samples from La Creacion at San Ildefonso College in Mexico City point to copal resin as the binder, with no beeswax detected. In the analysis published in ACS Omega on 15 July and led by Pablo Aguilar-Rodriguez with a Mexican research team, mass spectrometry, high-resolution microscopy, proton nuclear magnetic resonance at 700 megahertz, polarised light microscopy and micro-FTIR were applied to one-to-two-milligram samples taken from several points on the mural Rivera painted in 1922 and 1923. Alongside copal the team identified calcite, barite, talc and gypsum as fillers, zinc lactate formed by heating, and ethyl phthalate probably from air pollution or an earlier conservation treatment. Laboratory samples prepared following Rivera's documented recipe were heated with a blowtorch for fifteen seconds to reproduce his technique. The authors say the distribution of these ingredients across the mural still needs work.[2]
Materials knowledge runs in two time directions
The two results place two directions of materials knowledge side by side. The Edinburgh group uses a known magnetic model to calculate a lower-energy route for reversal; because no device was built, the result remains design guidance. The Mexican team starts from a historical recipe and measures which binders remain in samples from the actual mural; the absence of beeswax exposes a difference between the recipe and the physical object. In the first case mathematics shapes a future switching pulse, while in the second chemical traces reconstruct a past production process. Neither rests on one observation: the magnetic calculation gains meaning from comparison baselines and physical limits, while the mural analysis depends on complementary spectroscopy and microscopy methods. Together they make both how a material might be changed and how it was changed in the past available to measurement. The methodological difference also changes the kind of evidence. In the magnetic study, computation selects the pulse shape in advance and makes the switching result testable. In the Rivera study, spectroscopic and chemical analysis moves from preserved layers back toward the binder used in the past. One designs a future intervention while the other reconstructs an earlier production choice; both rely on the material's internal response rather than surface appearance alone.[1], [2]
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