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Story summary
- Researchers grew a two-nanometer-thick RuO2 film under epitaxial strain and observed emergent magnetic order.
- Spin-resolved ARPES showed a momentum-dependent spin texture that varies with electron momentum.
- Symmetry analysis excluded non-magnetic origins, indicating the texture arises from strain-induced weak ferromagnetism or altermagnetism.
- Repeated measurements in two geometries and X-ray and optical tests confirmed the film remained strained and retained crystal symmetry, suggesting epitaxial strain can switch magnetic properties for spintronic devices.
