Scientists at the University of Exeter have discovered a technique to transform ambient heat into motion in nanoscale devices. This thermal ratchet is made from a material known as “artificial spin ice,†which comprises a number of tiny nanomagnets made of the nickel-iron alloy Permalloy, and which are 200 times smaller than the diameter of a human hair.
from NASA Tech Briefs http://ift.tt/2AJo4lB
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