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Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Researchers report that impact-glass particles in two Chang’e-6 lunar-soil samples contain face-centered cubic γ-Fe (gamma iron), a phase not previously identified in natural lunar samples. In laboratory observations, relatively large particles formed a stable single-vortex magnetic state. The team proposes that this unusual iron could preserve magnetic information—but it has not yet provided a timeline of the Moon’s ancient magnetic field.
What is the magnetic fossil found in Chang’e-6 soil?
It is γ-Fe, or gamma iron: an iron phase with a face-centered cubic crystal structure. The particles were found embedded in impact glass in two samples examined by the research team. The Chinese Academy of Sciences (CAS) describes this as the first identification of γ-Fe in natural lunar samples. It is a discovery in specific glass particles, not evidence that γ-Fe occurs throughout lunar soil.
The study was led by Prof. Du Haifeng of the High Magnetic Field Laboratory at the Hefei Institutes of Physical Science, CAS, and was published in Proceedings of the National Academy of Sciences on September 16, 2026, according to the CAS report dated September 24, 2026.
Why call it a magnetic “time capsule”?
The phrase refers to a proposed ability to retain magnetic information. Using off-axis electron holography, the researchers examined the magnetic structure of individual γ-Fe nanoparticles. They observed a stable single-vortex magnetic state in relatively large particles and a stable response when an external magnetic field was applied. These results suggest the particles could preserve information about magnetism, but do not demonstrate that they have recorded the Moon’s global magnetic field or reveal when any such recording occurred.
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The Moon no longer has a global magnetic field, CAS notes, but lunar rocks and soil can retain evidence of ancient magnetism. Whether γ-Fe makes a useful additional recorder—and what magnetic events it might preserve—requires further study.
How could gamma iron survive in lunar impact glass?
Gamma iron is normally stable at high temperatures and transforms into α-Fe (alpha iron) as it cools. The researchers propose that trace carbon and other elements, rapid cooling of impact-generated melts, and the surrounding glass matrix may have helped preserve γ-Fe under lunar surface conditions. This is a proposed explanation, not a demonstrated account of every particle’s formation.
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The team reports γ-Fe as the dominant iron phase in the two impact-glass samples it studied. It also notes that γ-Fe and α-Fe form under different conditions and have different magnetic properties. The phases may therefore preserve evidence from different stages of lunar impacts, although the report does not establish precise recording windows for either.
How was the material examined?
The CAS account describes a sequence of sample preparation and nanoscale analysis:
- Researchers prepared material from the impact glass using focused ion beam methods.
- Transmission electron microscopy and chemical analysis were used to identify nanoscale iron particles and determine their phase.
- Off-axis electron holography was used to study the magnetic structure of individual γ-Fe nanoparticles.
The CAS report does not give a particle count, a quantitative magnetic moment, or an ancient field-strength estimate derived from γ-Fe. The finding supports a possible recording role, but not a numerical reconstruction of lunar magnetic history.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How does this compare with other Chang’e-6 magnetism findings?
Other studies of Chang’e-6 material address different samples and questions. Their measurements should not be treated as results from the γ-Fe particles.
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| Study | Material and scale | Method or finding | What it indicates |
|---|---|---|---|
| 2026 γ-Fe study, reported by CAS | Individual nanoscale iron particles embedded in two impact-glass samples | Microscopy, chemical analysis and electron holography; γ-Fe particles showed a stable single-vortex magnetic state | Possible magnetic recorder; not a measured timeline or field-strength estimate |
| 2025 Nature Communications study | Two aliquots of Chang’e-6 farside scooped soil from the South Pole–Aitken Basin | Bulk magnetic measurements and analysis of iron-bearing mineral populations | Reported higher magnetic susceptibility and saturation magnetization than comparison lunar samples, and the highest reported saturation remanence among returned lunar samples. Nickel-poor iron in basalt clasts was attributed to magmatic origins; nickel-rich metallic iron and Fe-Ni alloys in breccias, agglutinates and glassy material were attributed to impact-related populations. See the 2025 paper. |
| Chang’e-6 basalt paleointensity study | Basalt clasts dated to about 2.8 billion years ago | Paleointensity analysis | Authors reported estimates around 5–21 μT, with a median around 13 μT, and interpreted them as a possible rebound in lunar dynamo field strength after a decline around 3.1 billion years ago. These estimates concern basalt clasts, not γ-Fe. See the Nature paper. |
The 2025 soil study concerns bulk properties and mineral origins; the basalt study estimates an ancient field intensity from rock clasts. The γ-Fe work instead investigates magnetic behavior at the scale of particles in impact glass. The studies offer complementary context, but one cannot supply missing measurements or conclusions for another.
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