Gearing up: a ratchet comprising a gear wheel and a spring-loaded pawl. (Courtesy: iStock/PeteMuller) A thought experiment proposed more than 50 years ago by Richard Feynman has finally been realized ...
An artificial spin ice array exploits two-dimensional chirality to take a step towards technology. The functionality of the micromagnetic array may be understood by analogy with a mechanical ratchet ...
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