![]() ![]() It is further shown that the electrical power generated by the hybrid TENG is more than 35× higher than that obtained by a conventional thermomagnetic generator driven by magnetic induction. The applicability of this concept is demonstrated in a broad range of operating temperatures in both the cold (15 to 37 ☌) and hot (60 to 90 ☌) sides. This mechanical motion is then converted into electrical energy using a low‐cost triboelectric nanogenerator (TENG). The thermomagnetic effect allows to induce the periodic and sustained motion of a second‐order ferromagnetic material in temperature gradients below 30 ☌. Here, a hybrid device that couples triboelectric and thermomagnetic effects to generate electrical power in the presence of small temperature gradients near room temperature is demonstrated. The maximum power per footprint is 23.8 µWcm⁻², at which the Gd film undergoes a temperature change of only 0.9 ☌ at ≈10 ☌ above Tc.ĭeveloping new energy generation technologies able to effectively convert low‐grade thermal energy into electricity is an urgent necessity to tackle the continuous surge in energy demand and mitigate climate change. This performance occurs in a sharply bound range of ambient temperatures with an upper limit near the film's ferromagnetic to paramagnetic transition temperature Tc of 20 ☌ and of heat source temperatures ranging between 40 and 75 ☌. 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. ![]() Here, the performance of a Gadolinium (Gd)‐film‐based TMG that is optimized for resonant self‐actuation near room temperature is reported. 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. Key requirements for the development of efficient thermomagnetic generators (TMGs) are tailored thermomagnetic materials as well as innovative designs enabling fast heat transfer. Thermomagnetic generation is a promising technology for conversion of low‐grade waste heat into electricity. ![]()
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