What it is
Altermagnets share ferromagnetism's broken time-reversal symmetry but carry no net magnetization, a combination long inferred only from spatially averaged probes. Here researchers combined X-ray magnetic circular and linear dichroism with photoemission electron microscopy to directly map the local altermagnetic ordering vector in manganese telluride (MnTe). They resolved spin textures spanning 100-nanometre vortices and domain walls up to 10-micrometre single-domain states, and imposed chosen configurations using microstructure patterning and thermal cycling in magnetic fields.
Why it matters
Altermagnetism was proposed as a way to keep the time-reversal-symmetry breaking that makes ferromagnets useful for devices while shedding the net magnetization that limits scaling and clashes with superconducting and topological phases. Direct imaging and deliberate control of these states moves the material class from theoretical prediction to a manipulable experimental platform. It opens a route to spintronics without the stray fields that constrain conventional magnetic memory.
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Filed underaltermagnetism, spintronics, MnTe, magnetic imaging, condensed matter