Researchers at the Department of Energy’s Oak Ridge National Laboratory are pushing the frontiers of an eco-friendly technology that could redefine how we keep things cool, from groceries to gadgets. This technology, known as solid-state cooling, ditches the conventional refrigerants and moving parts in favor of a more quiet, compact, and precise temperature control system. According to the Oak Ridge National Laboratory, scientists are digging deeper into the atomic behaviors of materials to boost this technology's efficiency.
Their latest find, a nickel-cobalt-manganese-indium magnetic shape-memory alloy, showcases a remarkable trait: it can be deformed and snap back to its original form when it goes through a phase change triggered by heat or a magnetic field, as reported by the Oak Ridge National Laboratory. This process, where the material both absorbs and releases heat in response to a magnetic field, is called the magnetocaloric effect and is a key player in solid-state cooling applications; although the discovery of these sophisticated materials and the advent of high-performance devices have been promoting the advancements in this innovative cooling method, an in-depth comprehension of how to further enhance these materials remains critical.
Using advanced neutron-scattering instruments, the Oak Ridge team has scrutinized the material's atomic-scale workings. They observed that within the material's disordered atomic array, magnons—known as spin waves—and phonons, which are vibrations, engage in what is known as localized hybrid magnon-phonon modes, as per the Oak Ridge National Laboratory. It's these modes that the research indicates could have significant implications for how the material manages thermal energy, thus affecting its cooling capabilities.
