In a simple bilayer structure, spin torque induced by a reduced crystal symmetry switches perpendicular magnetization reliably at zero magnetic field.
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Lee, S., Ryu, J. & Park, BG. Magnetization switching through symmetry. Nat. Nanotechnol. 16, 227–228 (2021). https://doi.org/10.1038/s41565-021-00850-2
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DOI: https://doi.org/10.1038/s41565-021-00850-2
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