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In a paper published in Nature Materials, a group of researchers at the Catalan Institute of Nanotechnology (ICN, Spain) led by Prof. Sergio O. Valenzuela reports the observation of the magnon drag. This work ends a 50-year long effort to isolate this elusive thermoelectric effect.

As move past atoms in a solid, their charge distorts the nearby lattice and can create a wave. Reciprocally, a wave in the lattice affects the electrons motion, in analogy to a wave in the sea that pushes a surfer riding it. This interaction results in a thermoelectric effect that was first observed during the 1950's and has come to be known as phonon-drag, because it can be quantified from the flow of lattice-wave quanta () that occurs over the .

Soon after the discovery of the phonon drag, an analogous phenomenon was predicted to appear in : the so called magnon drag. In a magnetic material the intrinsic or spin of the electrons arrange in an organized fashion. In ferromagnets, the spins maintain a parallel orientation. If a distortion in the preferred spin orientation occurs, a spin wave is created that could affect . It is therefore reasonable to expect that the flow of magnons ( quanta) could also drag the electrons.

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