Title :
Thermal energy harvesting by high frequency actuation of magnetic shape memory alloy films
Author :
Gueltig, M. ; Ohtsuka, M. ; Miki, H. ; Takagi, T. ; Kohl, M.
Author_Institution :
Karlsruhe Inst. of Technol. (KIT), Karlsruhe, Germany
Abstract :
A novel energy harvesting device using magnetic shape memory alloy (MSMA) film actuation is presented showing a power density of up to 3 mW/cm3 at a temperature change of the material of about 2 K. This exceeds the power output of previous MSMA harvesting devices by at least three orders of magnitude and challenges state-of-the-art thermoelectrics. The results are accomplished by using a tailored Ni-Co-Mn-Ga film with large temperature-dependent change of magnetization at the Curie temperature TC and a new cantilever design, with low thermal mass for rapid heat transfer in the order of 10 ms, matching the time constant of eigenoscillation.
Keywords :
energy harvesting; heat transfer; shape memory effects; thermal engineering; Curie temperature; MSMA film actuation; MSMA harvesting devices; cantilever design; eigenoscillation; high frequency actuation; magnetic shape memory alloy films; power density; rapid heat transfer; thermal energy harvesting; thermal mass; Energy harvesting; Films; Force; Heating; Magnetization; Oscillators; Temperature; Energy Harvesting; Magnetic Shape Memory Alloys; Thermal Actuation;
Conference_Titel :
Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS), 2015 Transducers - 2015 18th International Conference on
Conference_Location :
Anchorage, AK
DOI :
10.1109/TRANSDUCERS.2015.7181024
