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Author: Nielsch, Kornelius Ă— Start date: 2020 Ă— DDC: 530 Ă— Version: publishedVersion Ă— search.filters.applied.f.series: JPhys energy 4 (2022), Nr. 2 Ă—

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    Origin and avoidance of double peaks in the induced voltage of a thermomagnetic generator for harvesting low-grade waste heat
    (Bristol : IOP Publishing, 2022) Dzekan, Daniel; Kischnik, Tim D.; Diestel, Anett; Nielsch, Kornelius; Fähler, Sebastian
    Thermomagnetic harvesting is an emerging approach used to convert low-grade waste heat to electricity, which recently obtained a boost due to the development of both more efficient functional materials and innovative device concepts. Here, we examine a thermomagnetic generator which utilizes gadolinium as the thermomagnetic material and report on the double peaks of the induced voltage. Using a combination of experiments and theory we show that these double peaks originate from the interaction between an asymmetric magnetization curve and a pretzel-like magnetic field topology. Double peaks are detrimental for the output power and can be avoided by matching the magnetization change by adjusting the cold and hot fluid flow.