A Gd‐Film Thermomagnetic Generator in Resonant Self‐Actuation Mode
In: ISSN: 1616-301X, 2023
Online
academicJournal
Zugriff:
International audience ; Thermomagnetic generation is a promising technology for conversion of low-grade waste heat into electricity. Key requirements for the development of efficient thermomagnetic generators (TMGs) are tailored thermomagnetic materials as well as innovative designs enabling fast heat transfer. Recently, film-based thermomagnetic generators are developed that operate in the mode of resonant self-actuation enabling high frequency and stroke of a movable cantilever and, thus, efficient conversion of thermal energy into electrical energy. Here, the performance of a Gadolinium (Gd)-film-based TMG that is optimized for resonant self-actuation near room temperature is reported. The Gd-film TMG exhibits large oscillation frequencies up to 106 Hz and large strokes up to 2 mm corresponding to 38% of the oscillating cantilever's length. This performance occurs in a sharply bound range of ambient temperatures with an upper limit near the film's ferromagnetic to paramagnetic transition temperature T c of 20 °C and of heat source temperatures ranging between 40 and 75 °C. The maximum power per footprint is 23.8 µWcm −2 , at which the Gd film undergoes a temperature change of only 0.9 °C at ≈10 °C above T c .
Titel: |
A Gd‐Film Thermomagnetic Generator in Resonant Self‐Actuation Mode
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Autor/in / Beteiligte Person: | Joseph, Joel ; Fontana, Erika ; Devillers, Thibaut ; Dempsey, Nora ; Kohl, Manfred ; Karlsruhe Institute of Technology (KIT) ; Micro et NanoMagnétisme (NEEL - MNM) ; Institut Néel (NEEL) ; Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) ; Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) ; Université Grenoble Alpes (UGA) ; ANR-18-CE05-0019,HiPerTherMag,Micro-dispositif performant pour la récupération de chaleur de bas niveau(2018) |
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Zeitschrift: | ISSN: 1616-301X, 2023 |
Veröffentlichung: | HAL CCSD ; Wiley, 2023 |
Medientyp: | academicJournal |
DOI: | 10.1002/adfm.202301250 |
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