CC BY 4.0 UnportedDzekan, DanielKischnik, Tim D.Diestel, AnettNielsch, KorneliusFähler, Sebastian2022-07-112022-07-112022https://oa.tib.eu/renate/handle/123456789/9706https://doi.org/10.34657/8744Thermomagnetic 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.enghttps://creativecommons.org/licenses/by/4.0/530Magnetocaloric materialThermomagnetic energy harvestingThermomagnetic generatorThermomagnetic materialwaste-heat recoveryArticle