Paramagnetic spins take electrons for a ride, produce electricity from heat

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Magnon-electron drag is an advective effect between magnons (waves of precession in the spins of individual atoms & represented as little grey cones) and electrons (green dots). The thermal gradient creates a gradient in the angles of the precession cones, which leads to a flow of magnons that then drags electrons along and creates thermopower. In the paramagnetic state, the local thermal fluctuations of magnetization (i.e. paramagnons) form little packets of magnons. These paramagnons can transfer the momentum they acquire in the thermal gradient to electrons and generate thermopower. In contrast, in a classical paramagnet, magnetic moments on the individual atoms are completely uncorrelated; there is no paramagnon or paramagnon drag thermopower in that case. Credit: Renee Ripley, Ohio State University
An international team of researchers has observed that local thermal perturbations of spins in a solid can convert heat to energy even in a paramagnetic material—where spins weren't thought to correlate long enough to do so. This effect, which the researchers call "paramagnon drag thermopower," converts a temperature difference into an electrical voltage. This discovery could lead to more efficient thermal energy harvesting—for example, converting car exhaust heat into electric power to enhance fuel-efficiency, or powering smart clothing by body heat.

Uploaded by ..Ajeet Vishwakarma
Department of Electronics and communication
TIH team member

Email id .... theinnovationhub2019@gmail.com

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