Speaker
Description
In this work, we present a refrigeration device based on the cooling by heating principle, where a quantum dot mediates energy transfer between two ferromagnetic metals and a hot magnetic insulator. Magnons from the magnetic insulator drive hot electrons from the colder to the hotter ferromagnetic electrode, resulting in cooling of the cold metallic lead. Our calculations reveal that the coefficient of performance depends on the quantum dot energy level, magnetic field, and electrode polarization. Optimal cooling is achieved with fully spin-polarized electrodes in an antiparallel magnetic configuration. However, as spin polarization decreases, a significant parasitic heat flow arises due to unwanted spin-down electrons entering the cold reservoir. This parasitic current not only reduces the net cooling power but also severely limits the device’s operational temperature range. Our study highlights quantum dots as efficient platforms for magnon-driven refrigeration, offering valuable insights for spintronic and quantum technologies.
